The Unbeatable Squirrel Girl is a rare Legendary Creature — Squirrel Human Hero card from Marvel Super Heroes (MSH), collector number 371. Current market price: $6.25 (foil $10.17), TCGplayer market prices via Scryfall.
Do You Like Squirrels? — Whenever The Unbeatable Squirrel Girl enters or attacks, create a 1/1 green Squirrel creature token. I LOVE Squirrels! — {1}{G}{G}{G}: Create X 1/1 green Squirrel creature tokens, where X is the number of Squirrels you control.