Overview

Sliver Swarm is built around the synergistic nature of sliver tribal: every sliver shares abilities with every other sliver, meaning the board compounds in power with each new sliver added. Sliver Gravemother gives all slivers Encore equal to their mana cost. Encore is an activated ability that exiles a creature from your graveyard and creates attacking token copies of it for each opponent — one per opponent, each attacking a different player — all with haste.

The result is a deck that leverages the graveyard as a secondary army. When Slivers die, they become an Encore source that can flood the board with hasty copies and rebuild the hive in a single activation. Combined with lords like Megantic Sliver and Sliver Hivelord, which gives your Slivers indestructible, the deck becomes extraordinarily threatening once the hive reaches critical mass.

Key Cards

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Sliver Hivelord
Protection · Five-Colour Lord
A five-colour 5/5 legendary Sliver, and because of Sliver Gravemother the legend rule does not apply to your Slivers. Sliver creatures you control have indestructible, which makes the hive extremely hard to remove with damage or destroy effects.
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Megantic Sliver
Lord · Finisher
A six-mana 3/3 that gives Sliver creatures you control +3/+3. With a typical mid-game board of five or six Slivers it turns every one of them into a serious threat, and the effect stacks if you have more than one lord.
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Crystalline Sliver
Protection · Hexproof Grant
All Slivers have shroud. The entire hive becomes untargetable by opponents' spells and abilities the moment Crystalline Sliver hits the battlefield. This single card invalidates most single-target removal in Commander. Opponents are forced to use board wipes rather than spot removal, and even board wipes are less efficient against a hive that can rebuild through Sliver Gravemother's Encore ability. Crystalline Sliver is one of the primary reasons sliver tribal is difficult to interact with.
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Brood Sliver
Token Maker · Combat Payoff
A five-mana 3/3. Whenever a Sliver deals combat damage to a player, its controller may create a 1/1 colorless Sliver creature token. Every Sliver you control becomes a token generator the moment it connects.

Playing the Deck

The opening turns are about colour fixing and deploying early slivers. Five-colour mana bases require thoughtful land sequencing, and the deck includes mana slivers like Manaweft Sliver and Gemhide Sliver that turn every sliver into a mana producer. Hitting these early dramatically accelerates the rest of the game, as slivers themselves become the ramp in addition to the win condition.

The mid game is hive assembly. Each new Sliver shares its abilities with every other, so the order of deployment matters. Priority goes to protection Slivers (Crystalline Sliver and Sliver Hivelord), Brood Sliver to turn combat damage into more bodies, and Regal Sliver to make you the monarch for the extra card each turn.

The late game is usually a single devastating combat. Megantic Sliver giving every Sliver +3/+3 creates a board large enough to kill multiple players in one attack. Sliver Gravemother's Encore then rebuilds any Slivers that die in combat, ensuring the hive persists into future turns.

Strengths & Weaknesses

Strengths: Sliver tribal is one of the most synergistic archetypes in Commander. Crystalline Sliver's shroud protection and Sliver Hivelord's indestructible make the board very hard to remove, and Brood Sliver's token generation means the hive assembles far faster than opponents expect. Sliver Gravemother's Encore provides genuine resilience against board wipes, a traditional weakness of creature-heavy strategies.

Weaknesses: The deck is a known quantity at most tables and will draw early hate from experienced players who understand how dangerous a fully assembled sliver hive becomes. Five-colour mana bases are vulnerable to colour screw in the opening hand. Opponents who play mass exile effects rather than destroy effects cleanly answer both the sliver board and the Encore graveyard engine simultaneously.

Want to improve it? See the Sliver Swarm upgrade guide: 4 cheap swaps with the data behind each one.

Verdict
Sliver Swarm is a powerful precon from Commander Masters and a strong out-of-the-box Sliver deck. Sliver Gravemother's Encore ability elegantly solves Sliver tribal's historic Achilles heel, vulnerability to board wipes, while Sliver Hivelord, Megantic Sliver and Crystalline Sliver ensure the deck has genuine competitive power. The five-colour mana base is surprisingly functional given the Sliver mana producers in the list. Players who want to experience the classic Sliver fantasy at its most realised will find this deck extremely satisfying to pilot, even if it invites table aggro at higher power tables.

Want to build a fully optimised sliver tribal upgrade? Let the Oracle find the best synergies.

✦ Build with The Oracle

Frequently Asked Questions

What cards are in the Sliver Swarm decklist?
The Sliver Swarm precon is a 100-card Commander deck led by Sliver Gravemother. The full Sliver Swarm decklist, with every card, current prices and a button to copy the list into your deck builder, is on this page.

Who is the commander of Sliver Swarm?
Sliver Swarm is led by Sliver Gravemother, a white, blue, black, red and green commander.

Which set is Sliver Swarm from?
Sliver Swarm was released in 2023 as part of Commander Masters.

How can I upgrade Sliver Swarm?
We have a step-by-step upgrade guide for Sliver Swarm that lists specific cards to cut and add, with the reason for each swap.

Full Decklist

All 100 cards from the out-of-the-box Sliver Swarm precon, enriched with current prices. Click any card to expand it.

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