Vraska, Golgari Queen
Legendary Planeswalker — Vraska
Oracle Text
+2: You may sacrifice another permanent. If you do, you gain 1 life and draw a card. −3: Destroy target nonland permanent with mana value 3 or less. −9: You get an emblem with "Whenever a creature you control deals combat damage to a player, that player loses the game."Rulings (3)
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Wizards of the CoastYou choose whether to sacrifice a permanent (and which one to sacrifice) while Vraska's first ability is resolving. No player may take actions between the time you choose which permanent to sacrifice and the time you do so.
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Wizards of the CoastIf a permanent has
in its mana cost, X is considered to be 0.
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Wizards of the CoastTokens that aren't a copy of something else don't have a mana cost. Anything without a mana cost normally has a mana value of 0.