Lunatic Bouncer

Whenever ~ is put into your graveyard from play, you
may exile it instead of putting it into your graveyard.
Then, at any time, once before your next turn, you may
pay {u}{u}. If you do, reveal the top card of your library.
If it's a creature card with converted mana cost less than
or equal to the mana value of ~, you may put it onto the
battlefield. Otherwise, put ~ onto the battlefield under
your control.
"I'm not crazy... I just like to bounce things!"