Crowd of Cinders is a uncommon Creature — Elemental card from Duels of the Planeswalkers (DPA), collector number 21. Current market price: $0.40, TCGplayer market prices via Scryfall.
Fear (This creature can't be blocked except by artifact creatures and/or black creatures.) Crowd of Cinders's power and toughness are each equal to the number of black permanents you control.