Radagast's Sled

{3}: Mount. (Exile target creature you control. Radagast's Sled gets +X/+X, where X is the exiled creature's power, and gains all that creature's abilities until end of turn. At the beginning of your next end step, if Radagast's Sled is on the battlefield, return the exiled creature onto the battlefield tapped. You may not mount more than one creature each turn.)