Unholy Ritual

At the beginning of any combat phase, you may sacrifice another permanent. If you do, Unholy
Ritual becomes a 4/3 Spirit creature token with
flying and indestructible until end of turn.
At the beginning of your end step, you may
sacrifice another permanent. If you do, exile the
top card of your graveyard until you find a card
with the same card type as that permanent. Put
that card into your hand.