Shifty Doppelganger
Odyssey — rare
Creature — Shapeshifter
Shifty Doppelganger rulings:
2008-08-01: This card has received errata such that putting a creature card from your hand onto the battlefield is now optional. This means you no longer need a third-party to verify that you don’t have any creature cards in your hand if you don’t put something onto the battlefield.
2004-10-04: If the creature is not still on the battlefield at beginning of the End step, then you do not return this card to the battlefield.