Abnegation Serum

{w}{u},{t}: Reveal cards from the top of your library until you reveal a creature card. Exile
it, and put all other cards revealed on the bottom of your library in a random order.
Then, put a serum counter on target creature
if it doesn't have a serum counter on it, and it becomes a copy of the exiled creature card except for power and toughness for as long as
it has a serum counter on it.