Experiment One is a common Creature — Human Ooze card from Double Masters 2022 (2X2), collector number 146. Current market price: $0.28 (foil $0.28), TCGplayer market prices via Scryfall.
Evolve (Whenever a creature you control enters, if that creature has greater power or toughness than this creature, put a +1/+1 counter on this creature.) Remove two +1/+1 counters from this creature: Regenerate it. (The next time this creature would be destroyed this turn, instead tap it, remove it from combat, and heal all damage on it.)