Kai, Cursed Rogue

Haste, Menace, Deathtouch
When Kai, Cursed Rogue enters the battlefield
exile top card from library, you may play this
card before opponents next endstep, if not
exile permanently and lose 2 life.
{t}{2}{b} Sneak Attack! Choose a creature card
from your hand and put that creature into play.
It is unaffected by summoning sickness.
If excess damage is dealt, draw a card for each
point of player damage. Sacrifice Creature at
end of combat.