Vigilance, Menace, Reach

Cerberus, Guardian of the Underworld can't be blocked except by three or more creatures.

Whenever a creature card is put into a graveyard from anywhere, you may exile it. If you do, put a +1/+1 counter on Cerberus.

At the beginning of your upkeep, you may choose a card exiled with Cerberus and return it to its owner's graveyard. If you do, Cerberus deals damage to any target equal to the exiled card's converted mana cost.