Wildfire Cerberus is a uncommon Creature — Dog card from Journey into Nyx (JOU), collector number 116. Current market price: $0.11 (foil $0.25), TCGplayer market prices via Scryfall.
{5}{R}{R}: Monstrosity 1. (If this creature isn't monstrous, put a +1/+1 counter on it and it becomes monstrous.) When this creature becomes monstrous, it deals 2 damage to each opponent and each creature they control.