Hydra Broodmaster is a rare Creature — Hydra card from Commander 2021 (C21), collector number 194. Current market price: $0.36, 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.