Gyre Sage is a rare Creature — Elf Druid card from Gatecrash (GTC), collector number 123. Current market price: $1.25 (foil $13.23), 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.) {T}: Add {G} for each +1/+1 counter on this creature.