Anabad, the Loreseeker

At the beginning of each combat, sacrifice a creature. Creatures you control gain +X/+X until end of turn where X is that creatures power.
Creature cards in your graveyard have recycling {u}. ({u}, Exile this card from your graveyard: Draw a card.)
{7}{b}{b}: Destroy all creatures and return each creature from exile to the battlefield tapped.