Big Bertha is a uncommon Legendary Creature — Mutant Hero card from Marvel Super Heroes Commander (MSC), collector number 714. Current market price: $0.31 (foil $0.73), TCGplayer market prices via Scryfall.
Vigilance Big Bertha enters with X +1/+1 counters on her. {1}{G}, {T}: Put a +1/+1 counter on Big Bertha.