Vraska, Golgari Queen

[+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."

Secret Lair Drop

Planeswalker Championship Promos

Mythic Edition

+2: You may sacrifice another permanent. If you do, you gain 1 life and draw a card.
−3: Destroy target nonland permanent with converted mana cost 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."

Guilds of Ravnica

If a permanent has {X} in its mana cost, X is considered to be 0.

Tokens 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.

You 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.