Megara, Fury of the Void

System Alz — {2}{p/b}: Exchange this creature with another creature with this ability that you own
outside the game.
Whenever Megara, Fury of the Void deals
combat damage to a player, that player discards
a card.
{2}{p/b}{p/b}, {t}: Return target Alter creature card
from your graveyard to your hand.