Stifle (Invocation) [Amonkhet Invocations] Magic 2011 Promos sacrifice it unless you exile

sacrifice it unless you exile another Merfolk you control

Set: Beta Edition Type: Creature — Rat Rarity: Common Cost: {2}{B} Plague Rats's power and toughness are each equal to the number of creatures named Plague Rats on the battlefield

not its controller

At the beginning of each opponent's end step

Set: Shadows over Innistrad Promos Type: Instant Rarity: Rare Cost: {1}{W}{B} Exile target nonland permanent

Stifle (Invocation) [Amonkhet Invocations] Magic 2011 Promos sacrifice it unless you exileSet: Amonkhet Invocations Type: Instant Rarity: Mythic Cost: {U} Counter target activated or triggered ability. (Mana abilities can't be targeted.)