Duriel, Lord of Pain

Haste
whenever another creature is damaged Duriel, Lord of pain gains +2/+0 until the end of your turn.
{1}{r}: deal 1 damage to Duriel, Lord of Pain, then Duriel, Lord of pain gains +4/+0 until the end of your turn.(this ability can only be activated once a turn.)
"I am your doom!!"-Duriel, Lord of Pain