Simic Fluxmage is a uncommon Creature — Merfolk Wizard card from Gatecrash (GTC), collector number 49. Current market price: $0.07 (foil $0.44), 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.) {1}{U}, {T}: Move a +1/+1 counter from this creature onto target creature.