Forgotten Shapeshifter

You may have Forgotten Shapeshifter enters the battlefield as a copy of any creature on the battlefield.
Whenever Forgotten Shapeshifter attacks reveal
cards from the top of your library until you reveal
two creature cards. Forgotten shapeshifter
becomes a copy of the creature with the least
power and you put the other card in your hand,
then put the revealed cards into your graveyard.