Voracious Brood is a uncommon Creature — Alien Insect card from Marvel Super Heroes Commander (MSC), collector number 735. Current market price: $0.35 (foil $1.25), TCGplayer market prices via Scryfall.
This creature enters with a +1/+1 counter on it for each creature card in your graveyard. Whenever one or more creature cards are put into your graveyard from anywhere, put that many +1/+1 counters on this creature.