Kha'Zix, the Voidreaver

Assassin (This creature has flash. When it enters
the battlefield, you may have it deal damage equal its
power to target tapped creature you don't control.)
{2}{b/g}: Return Kha'Zix to your hand.
{b/g}: Shuffle Kha'Zix on your library, then draw
a card. Activate this ability only once each turn.
"Change... is good."