Lotan, Blood-Circle Liege

Fear (This creature can't be blocked except by artifact creatures and/or black creatures.)

Whenever creature an opponent controls dies,
you may choose one of the following:

• Put X +1/+1 counters on Lotan, Blood-Circle Liege, where X is that creature's total mana cost.
• Create a treasure token equal to the number of colored mana in the creature’s mana cost.