Rassilon, the Immortal

Rassilon, the Immortal can become a copy of a creature you control and gain its power and toughness and abilities once per turn. It also gains regenerate.
{u}{b}{r}{g}{t}: regenerate this creature.
{u}{u}{b}{b}{r}{r}{g}{g}{t}: bounce this creature back to your hand.
Time for me is nothing, but for you it shall end!- Rassilon