Cosmotronic Wave 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
Cosmotronic Wave deals 1 damage to each creature your opponents control. Creatures your opponents control can't block this turn.
Complete guide
Cosmotronic Wave is a versatile red sorcery that can act as both a board-clearing ping and a powerful finisher. By damaging every opposing creature and removing their ability to block, it clears the path for a lethal assault. This card is particularly effective against 'go-wide' strategies utilizing small tokens.
A Two-Part Effect
Cosmotronic Wave performs two distinct actions when it resolves. First, it deals 1 damage to every creature currently controlled by your opponents. Second, it creates a continuous effect that lasts for the duration of the turn, preventing any creature controlled by an opponent from being declared as a blocker.
Dynamic Blocking Restrictions
Unlike many effects that modify creature stats, the 'can't block' portion of this spell does not lock in the set of affected creatures at the moment of resolution. According to official rulings, because this effect doesn't change permanent characteristics (like power or toughness), it applies to the player's opponents. This means even creatures that enter the battlefield or change control to an opponent after the spell has resolved will still be unable to block for the rest of the turn.
Resolution Step-by-Step
When you cast the spell, it goes on the stack. Upon resolution: 1. Identify every creature controlled by your opponents. 2. Deal 1 damage to each of them simultaneously. 3. State-based actions are checked, and creatures with 0 toughness or damage equal to their toughness are destroyed. 4. A lingering restriction is placed on all opponents, preventing their creatures from blocking until the cleanup step.
Timing and Strategy
Since this is a sorcery, you must cast it during one of your main phases. To maximize its impact, you should usually cast it during your pre-combat main phase. This ensures that the damage is dealt and the 'can't block' restriction is active before you move to the declare attackers step.
Interaction examples
Mana GeyserIf your opponents have many tapped lands, you can cast Mana Geyser to generate a large amount of red mana. You can then use that mana to cast Cosmotronic Wave, effectively spending a small portion of your temporary ritual mana to ensure your entire army can attack without being blocked by the opponents' tapped-out creatures.
Jeska's WillIf you control your commander, you can cast Jeska's Will to choose both modes. This allows you to exile the top three cards of your library and gain mana based on an opponent's hand size. If Cosmotronic Wave is among the exiled cards, you can use the generated mana to cast it immediately, dealing 1 damage to all enemies and preventing them from blocking your commander's attack.
Guide written with AI from the official text and rulings. Official English text prevails.
How it works : Cosmotronic Wave
Original English text — Wizards of the Coast / Scryfall
- #1· Wizards of the Coast
Because Cosmotronic Wave doesn’t change the characteristics of any permanents, the set of creatures affected by its second effect is constantly updated. Creatures that come under an opponent’s control later in the turn can’t block.
No other card is named in this ruling.
Legal formats
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Meta decks with Cosmotronic Wave
No archived Top 8 deck with this card yet.