Nightmares Heart

Eternal (This creature can’t leave the battlefield except if its controller sacrifices it.) Nightmares Heart can be a commander along with Grimm, Troupe leader At the beginning of your upkeep you may sacrifice a creature. If you do Target creature Gets a +X/+X counter where X is twice that Creatures mana cost, if the sacrificed creature was a token creature give target creature a +1/+1 counter instead.{flavor}“Burn the father, feed the child.”