Diffusion Sliver is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.
Official card text
Whenever a Sliver creature you control becomes the target of a spell or ability an opponent controls, counter that spell or ability unless its controller pays.
Complete guide
Diffusion Sliver is a powerful defensive tool for Sliver decks, forcing your opponents to pay extra for every attempt to interact with your board. By turning every Sliver into a tax-collector, it slows down removal and ensures your hive survives long enough to swarm the battlefield. Unlike older Slivers, this blue-aligned creature only protects your own kin, giving you a distinct tactical advantage.
What It Does
Diffusion Sliver grants a triggered ability to every Sliver creature you control. Whenever an opponent targets one of your Slivers with a spell or an ability, this ability triggers and creates a tax. The opponent must pay {2} immediately or their spell or ability is countered. This applies to everything from standard removal spells like those targeting a creature to triggered abilities and activated abilities that require a target.
How It Resolves
The process happens in three main steps. First, an opponent casts a spell or activates an ability targeting one of your Slivers. Second, the Diffusion Sliver's ability triggers and is placed on the stack above the opponent's action. Third, as the triggered ability resolves, the opponent is given a choice to pay {2} mana; if they do not, the spell or ability is countered and removed from the stack without having any effect.
Common Mistakes
A frequent misconception is that multiple Diffusion Slivers don't stack. In fact, these abilities are cumulative. If you control two Diffusion Slivers, each one will trigger separately when a Sliver is targeted, forcing the opponent to pay {2} twice (a total of {4}) to let their spell resolve. Additionally, remember that this tax only applies to spells and abilities controlled by an opponent; your own spells can still target your Slivers without any extra cost.
When to Play It
You should play Diffusion Sliver early in the game to establish a protective barrier for your more aggressive Slivers. It is particularly effective against decks that rely on 'one-for-one' removal spells. By forcing an opponent to spend four or five mana on a two-mana removal spell, you disrupt their mana curve and gain a massive tempo advantage.
Interaction examples
If your opponent casts a spell to destroy your Diffusion Sliver, its own ability triggers. The opponent must pay an additional {2} or their spell is countered. Even though the Sliver is the target, it protects itself.
Ornithopter of ParadiseIf you have both creatures on the battlefield, the Ornithopter of Paradise does not benefit from the protection because it is a Thopter, not a Sliver. Only creatures with the Sliver type receive the 'tax' ability from Diffusion Sliver.
Foundry InspectorIf you have two copies of Diffusion Sliver on the battlefield and an opponent tries to target your Foundry Inspector (assuming an effect has made the Inspector a Sliver), two separate triggers go on the stack. The opponent must pay {2} for the first trigger and {2} for the second trigger, totaling {4} mana to successfully target the creature.
Guide written with AI from the official text and rulings. Official English text prevails.
How it works : Diffusion Sliver
Original English text — Wizards of the Coast / Scryfall
- #1· Wizards of the Coast
The granted ability applies to any spell (including Aura spells), activated ability, or triggered ability that’s controlled by an opponent that targets a Sliver you control.
No other card is named in this ruling.
- #2· Wizards of the Coast
Slivers in this set affect only Sliver creatures you control. They don’t grant bonuses to your opponents’ Slivers. This is the same way Slivers from the Magic 2014 core set worked, while Slivers in earlier sets granted bonuses to all Slivers.
No other card is named in this ruling.
- #3· Wizards of the Coast
Abilities that Slivers grant, as well as power/toughness boosts, are cumulative. However, for some abilities, like indestructible and the ability granted by Belligerent Sliver, having more than one instance of the ability doesn’t provide any additional benefit.
No other card is named in this ruling.
- #4· Wizards of the Coast
If you change the creature type of a Sliver you control so it’s no longer a Sliver, it will no longer be affected by its own ability. Its ability will continue to affect other Sliver creatures you control.
No other card is named in this ruling.
Legal formats
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Meta decks with Diffusion Sliver
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