Mitotic Slime is a rare Creature — Ooze card from Magic 2011 (M11), collector number 185. Current market price: $0.38 (foil $4.46), TCGplayer market prices via Scryfall.
When this creature dies, create two 2/2 green Ooze creature tokens. They have "When this token dies, create two 1/1 green Ooze creature tokens."