Sylvia of Dark Nights

+1: Put a revenge counter on another target creature or planeswalker. If there are 3 or more permanents with revenge counters on them, draw a card.
-X: You may destroy up to X permanents with hit counters on them. Exile any of them that are black or white. If you didn't, draw a card.
-10: Sylvia of Dark Nights deals 10 damage to creature and each planeswalker target opponent controls. That player loses half their life (rounded up)