Ninja, #1 Gamer

Haste, menace, hexproof from white and black
Whenever Ninja deals combat damage to a player
or planeswalker, you may pay {u}{r}{g}. If you do,
exile the top card of your library face down. You
may look at that card for as long as it remains
exiled. You may play that card without paying
its mana cost for as long as Ninja remains on the battlefield.
"I wanna see some movement!"