Heroes' Bane is a uncommon Creature — Hydra card from Iconic Masters (IMA), collector number 166. Current market price: $0.34 (foil $0.53), TCGplayer market prices via Scryfall.
This creature enters with four +1/+1 counters on it. {2}{G}{G}: Put X +1/+1 counters on this creature, where X is its power.