Slimer, Voracious Apparition - The Mimeoplasm (Rainbow Foil) (SLD-1773) - Secret Lair Drop Series Foil

As Slimer enters the battlefield, you may exile two creature cards from graveyards. If you do, it enters the battlefield as a copy of one of those cards with a number of additional +1/+1 counters on it equal to the power of the other card.