Sliver Swarm precon upgrade guide

Encore one Megantic Sliver at a four-player table and every Sliver you control gets +9/+9 until the end of the turn. That makes the box's most expensive Slivers better in the graveyard than in your hand, and it changes what you should cut.

Sliver Gravemother does two things. She switches off the legend rule for your Slivers, and she gives every Sliver creature card in your graveyard encore, at a cost equal to its mana value. Encore exiles the card and makes one hasty token copy for each opponent, each one attacking a different player, and all of them are sacrificed at the end step. She has to be on the battlefield for any of it to work, and you can only do it at sorcery speed.

The box around her is 40 Slivers plus Realmwalker, Titan of Littjara and Rukarumel, Biologist, and twelve of its cards ask you to name a creature type. It's a real typal deck, with twenty-one two-drops and an average mana value of 3.13. Two things hold it back. Sixteen of its thirty-seven lands enter tapped, and a handful of its cards quietly switch other cards off.

What are the best Sliver Swarm upgrades?

Nine swaps, best first. The top of the list is the card that decides the most Sliver turns, and the bottom is a land. Every price is Scryfall's market figure for the card's default printing on 11 September 2026.

1. The First Sliver, $39.28. Every Sliver spell you cast after it has cascade, so each one arrives with a free spell that costs less.
2. Sliver Hive ($11.59) and Ancient Ziggurat ($0.34). Two lands that enter untapped and make any colour. The Hive's coloured mana only casts Slivers and the Ziggurat's only casts creatures, and 42 of the 63 nonland cards in the upgraded ninety-nine are creatures.
3. Buried Alive, $2.06. Three creature cards from your library straight into the graveyard. With the Gravemother on the battlefield, that's three encore targets you picked yourself.
4. Morophon, the Boundless, $8.20. Name Sliver and every Sliver costs {W}{U}{B}{R}{G} less, which strips the coloured pips off the whole creature base. It's a changeling, so it counts as a Sliver for everything else in the deck too.
5. Swords to Plowshares and Path to Exile, $2.35 together. One-mana exile, in a deck whose other removal costs six mana (Constricting Sliver) or a Sliver (Necrotic Sliver).
6. Kindred Discovery, $5.87. A card every time a Sliver enters or attacks. One encore at a four-player table draws six: three tokens enter, then the same three attack.
7. City of Brass, $12.11. The third untapped land, and the only one of the three that pays for Swords to Plowshares, Path to Exile and the rest of the noncreature spells.

That's $81.80 for all nine. What comes out is below, starting with two cards that cancel each other.

Megantic Sliver is worth more in the graveyard

Encore costs a card's mana value, so bringing Megantic Sliver back costs the same six mana as casting it. What changes is what you get. From your hand it's one 3/3 that gives your Slivers +3/+3. Encored at a four-player table it's three token copies, and each copy gives every Sliver you control +3/+3, so the whole team gets +9/+9 and the three tokens attack as 12/12s with haste.

So the expensive Slivers stay, even though a six-drop with no evasion looks like the first thing a two-drop deck should cut:

• Might Sliver encores for five, and three copies give every Sliver +6/+6.
• Constricting Sliver gives every Sliver an exile trigger when it enters. Three copies arriving at once means each token enters carrying three of those triggers, so that's up to nine opposing creatures exiled until the tokens are sacrificed. Nobody is left to block.
• Brood Sliver triples too. With three copies out, each Sliver that hits a player makes three 1/1 Slivers.

The box has a few ways to put these cards in the graveyard on purpose. Hollowhead Sliver lets any Sliver discard a card to draw one, Titan of Littjara discards after it draws, Windfall empties everyone's hand, and Firewake Sliver and Necrotic Sliver can sacrifice a Sliver. None of those let you choose what goes in from the library. Buried Alive does: Megantic Sliver, Might Sliver and Constricting Sliver in one card, ready to encore the following turn.

Crystalline Sliver switches off Crypt Sliver

Crystalline Sliver gives all Slivers shroud. It's the best protection in the box, and it also means nothing can target a Sliver, including you. Crypt Sliver's only ability is "{T}: Regenerate target Sliver", so with Crystalline on the battlefield it does nothing at all. Firewake Sliver loses half its text the same way. Its sacrifice ability needs a target Sliver creature, so while Crystalline is out it's a haste lord and nothing more.

I'd keep Crystalline and lose Crypt. Clot Sliver's regeneration doesn't target, so the deck still has a way to regenerate, and Sliver Hivelord's indestructible covers the same threat without costing mana every time.

Four more come out for reasons of their own:

• Harmonic Sliver gives every Sliver "When this permanent enters, destroy target artifact or enchantment." The trigger isn't optional. If nobody else has an artifact or enchantment on the battlefield, each Sliver you cast has to destroy one of yours, and the box runs eight of them: seven artifacts, Sol Ring among them, plus Descendants' Fury.
• Decimate can't be cast until there's a legal artifact, creature, enchantment and land to target. Descendants' Fury is the box's only enchantment, so at a table without one Decimate sits in your hand, and at a table where the only enchantment is yours it takes that with it.
• Cleansing Nova destroys every creature, in a box with 43 of them in the ninety-nine. Two of the box's sweepers spare Slivers by design, and Nova isn't one of them.
• Rukarumel, Biologist costs five to make your creatures a type you name on top of what they already are. When nearly everything is a Sliver anyway, that does very little. It isn't a Sliver itself, and as a 3/3 it's the one creature of yours that Crippling Fear kills.

Name Sliver thirteen times, then check what the lands can pay for

Thirteen cards in the upgraded list make you choose a creature type: the box's twelve, less Rukarumel, plus Morophon and Kindred Discovery. The answer is Sliver on every one. The interesting part is what that does to the three creatures that aren't printed as Slivers.

Realmwalker and Morophon are changelings, so they're Slivers already. Titan of Littjara becomes one the moment it enters naming Sliver, which means it picks up every Sliver ability on the table and draws a card for each other Sliver when it enters or attacks. After the cuts, there's no creature in the ninety-nine that isn't a Sliver on the battlefield. Crippling Fear named Sliver gives -3/-3 to your opponents' creatures and none of yours. Harsh Mercy has each player name a type and destroys everything else, so you lose nothing and each opponent keeps one tribe.

The catch is mana. Pillar of Origins, Secluded Courtyard and Unclaimed Territory only make coloured mana for creature spells of the type you named, and Sliver Hive and Ancient Ziggurat narrow things the same way. That's five coloured sources that can't cast any of the fourteen coloured noncreature spells in the upgraded list, from Swords to Plowshares up to Crippling Fear. City of Brass is on the list partly to cover that gap.

Four Mirage fetches out, three untapped lands in

Sixteen lands in the box always enter tapped. Eight are tri-lands, three are cycling duals, one is Path of Ancestry, and four are the Mirage fetches: Flood Plain, Grasslands, Mountain Valley and Rocky Tar Pit. Each fetch enters tapped and then has to be tapped and sacrificed before it finds you anything.

With twenty two-drops in the upgraded list, a slow land costs more here than it would in a deck that ramps into big spells. The fetches are the four to go. The tri-lands pay for their tempo with three colours, the cycling duals turn into a card late in the game, and Path of Ancestry makes any colour and scries whenever you spend it on a Sliver, since the Gravemother shares that type.

Two of the replacements only fix for creatures and one fixes everything. Sliver Hive and Ancient Ziggurat both enter untapped and make any colour for a Sliver or a creature, and the Hive can make a 1/1 Sliver for five mana once the game goes long. City of Brass deals you a point of damage every time it taps, which is the price of the only one of the three that casts your sorceries. The land count drops from 37 to 36. That's enough with ten ramp pieces, two of which (Gemhide Sliver and Manaweft Sliver) let every Sliver on your side tap for a colour.

Always-tapped lands fall from sixteen to twelve, and untapped ones rise from sixteen to nineteen. Counting every source the usual way, the chance of having each colour for a two-drop on turn two goes up in all five colours and now sits between 86.3% (black) and 92.1% (green) on the play. That count treats the Hive and the Ziggurat as full sources, which is fair for a two-drop Sliver and wrong for Swords to Plowshares.

Morophon is the other half of the fix. With Sliver named, the reduction only touches coloured mana, so every Sliver in the deck loses its coloured pips. Galerider Sliver and Striking Sliver become free, so do Sliver Hivelord and The First Sliver, and the Gravemother costs nothing but her commander tax. If I were spending more on lands, the next one would be Cavern of Souls at $49.95: it's the Hive's colour fixing for Slivers, plus the Slivers can't be countered.

Two $40 legends I'd buy after The First Sliver

The First Sliver is first on the list because it changes every turn after it lands. A four-drop Sliver brings a free spell that costs three or less, and 25 of the 41 nonland cards at that cost in the upgraded list are Slivers. The Gravemother's legend-rule line helps here as well. Cast The First Sliver while Hatchery Sliver is out, pay the replicate, and the copy stays. Two of them means every later Sliver spell cascades twice, because each copy grants its own cascade.

Sliver Overlord ($39.75) would be my next buy, then Sliver Legion ($41.72). The Overlord tutors a Sliver for {3} as often as you can pay, and that's a new job in a deck light on card draw. The Legion gives every Sliver +1/+1 for each other Sliver, which is a bigger finisher but not a new role, since nine cards in the list already pump the team. Either one would take the upgrade past $120, so they sit outside the nine.

There's no protection spell on the list either. Heroic Intervention ($15.96) is the usual pick, and this deck needs it less than most. Hibernation Sliver lets every Sliver return to your hand for 2 life, which saves them from an exile sweeper as well as a destroy one, and Sliver Hivelord, Clot Sliver, Diffusion Sliver and Crystalline Sliver cover most of the rest between them.

The upgraded decklist

All nine swaps applied, 100 cards. Hover any card name on this page to see the card and its current price.

Load into the deck builder Copy decklist

“Load into the deck builder” opens this list in your account, pinned to the printings the box shipped, ready to edit or save. “Copy decklist” gives you plain text for Moxfield, Archidekt or Arena — no account needed.

FAQ

Does encore work while Sliver Gravemother is in the command zone?

No. Encore is an ability she grants to Sliver creature cards in your graveyard, and she only grants it while she's on the battlefield. The cost is generic mana equal to the card's mana value, it's sorcery speed, and it makes one hasty token per opponent, each one attacking a different player. The tokens are sacrificed at the next end step.

Which creature type should I name for Titan of Littjara, Morophon and the rest?

Sliver, on all thirteen cards that ask. Realmwalker and Morophon, the Boundless are changelings and already count, and Titan of Littjara becomes a Sliver when it enters naming one. After the cuts on this page, every creature in the ninety-nine is a Sliver once it's on the battlefield, so Crippling Fear named Sliver only shrinks your opponents' creatures.

How much do the nine Sliver Swarm swaps cost?

$81.80 for all nine, going by Scryfall's market price on each card's default printing as of 11 September 2026. The First Sliver is $39.28 of that and the three lands are $24.04 together, which leaves $18.48 for the other five. Sliver Overlord would be the next buy, at $39.75.

Is The First Sliver worth $39 in this deck?

It's the add I'd make first. Every Sliver spell you cast after it has cascade, and 25 of the 41 nonland cards costing three or less in the upgraded list are Slivers, so cascading off a four-drop usually finds another one. With the Gravemother out, a second copy made by Hatchery Sliver's replicate stays on the battlefield, and each copy gives your Sliver spells a separate cascade.

Do the old "All Slivers" cards help an opponent's Slivers?

Yes. Twelve cards in the upgraded list say "All Slivers" or "All Sliver creatures", which includes Slivers other players control, where the newer ones say "Sliver creatures you control". It rarely comes up, since it only matters when somebody else has a Sliver on the battlefield. Crystalline Sliver's shroud covers theirs as well.

Why cut Harmonic Sliver when the deck is short on removal?

Its trigger is mandatory. Every Sliver that enters has to destroy an artifact or enchantment, and if your opponents have none, it has to be one of yours. The box runs seven artifacts, Sol Ring included. Necrotic Sliver already turns every Sliver into removal for any permanent, and only when you choose.