Ninja of the Crimson Moon

Ninjutsu {1}{b}{r} ({1}{b}{r}: Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.)
When Ninja of the Crimson Moon deals combat
damage to an opponent, exile the top card of
your library. Until end of turn, you may play that
card without paying it's mana cost. If you don't,
deal damage to each opponent equal to it's
converted mana cost.