Akali, the Rogue Assassin

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.)
Akali can't block. Akali has hexproof as long as
it is untapped.
{1}{b/g}, {ut}: Remove Akali from combat.
"Fear the assassin with no master."