Hydra Broodmaster is a rare Creature — Hydra card from Journey into Nyx (JOU), collector number 128. Current market price: $0.27 (foil $2.44), TCGplayer market prices via Scryfall.
{X}{X}{G}: Monstrosity X. (If this creature isn't monstrous, put X +1/+1 counters on it and it becomes monstrous.) When this creature becomes monstrous, create X X/X green Hydra creature tokens.