Ashiok, Mother of Offerings

{2},{t}: Gain control of a target non-black
creature until the beginning of your next
upkeep. Untap it. It gains haste and
"This creature attacks each turn if able".
Play this ability only on your turn, and
only before your combat step.
{1}, Sacrifice a creature: Exile the top card of
your library. You may play that card this
turn.