Kostoroth, Eternal Scholar

Flying
Kostoroth costs {1} to cast for each noncreature
card in your graveyard if they have different converted mana costs.
Whenever Kostoroth attacks, exile a noncreature
card from your graveyard with an archive
counter on it, when you do, draw cards
equal to the converted mana cost of the card,
then discard that many cards. Kostoroth gets
+1/+1 for each card exiled with an archive
counter on it.