Xethrix, Soul Harvester

+1: Until your next turn, when a creature attacks you or a planeswalker you control, that creatures controller loses 2 life and you gain 2 life.
-2: Destroy target creature or planeswalker. You lose 2 life.
-7: Exile all cards from target opponent's graveyard. For each creature/planeswalker exiled this way, put a loyalty counter on target planeswalker.