Clinging Anemones is a common Creature — Jellyfish card from Gatecrash (GTC), collector number 31. Current market price: $0.12 (foil $0.30), TCGplayer market prices via Scryfall.
Defender 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.)