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Kaya, Orzhov Usurper
+1: Exile up to two target cards from a single graveyard. You gain 2 life if at least one creature card was exiled this way. −1: Exile target nonland permanent with mana value 1 or less. −5: Kaya deals damage to target player equal to the number of cards that player owns in exile and you gain that much life.
Rulings (3)
Jan 25, 2019 · If a permanent has {X} in its mana cost, X is considered to be 0.
Jan 25, 2019 · Kaya's last ability causes you to gain life equal to the number of cards the target player owns in exile, even if an effect causes her to deal more or less than that amount of damage to that player.
Jan 25, 2019 · 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.