The Astonishing Ant-Man is a rare Legendary Creature — Human Scientist Hero card from Marvel Super Heroes (MSH), collector number 204. Current market price: $0.28 (foil $0.66), TCGplayer market prices via Scryfall.
Whenever you draw a card, put a +1/+1 counter on The Astonishing Ant-Man. {2}{G}, {T}, Remove any number of +1/+1 counters from The Astonishing Ant-Man: Create that many 1/1 green Insect creature tokens.