Kaio-ken

Flash

When Kaio-ken enters the battlefield, target
creature gains +1/+1, haste, and first strike until
end of turn. Place an aura counter on Kaio-ken.

{2}: You take damage equal to 3 times X, where X is the number of aura counters on Kaio-ken. This damage cannot be prevented or reduced. Place an aura counter on Kaio-ken. Target creature gains haste, first strike, and +X/+X until end of turn, where X is the number of aura counters on Kaio-ken.