Fathom Mage is a rare Creature — Human Wizard card from Gatecrash (GTC), collector number 162. Current market price: $0.42 (foil $0.56), 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.) Whenever a +1/+1 counter is put on this creature, you may draw a card.