Kliff Undersn

Vigilance, First strike When Kliff Undersn enters, target opponent gains a stun counter. When a creature or player takes damage from the same source 2 times in one turn they gain a stun counter. If kliff attacks an opponent with 5 or more stun counters kliff is unblockable. If kliff attacks an opponent with 10 or more stun counters that player loses the game.