Darth Maul, Sith Apprentice

Double Strike, Haste
Whenever a creature an opponent controls dies by combat damage from Darth Maul, he gets a +1/+1 counter and you discard a card.
Target creature or player takes damage equal to the discarded card’s converted mana cost.
If Darth Maul would enter the graveyard from anywhere, exile him and transform him.