Glister Bairn is a uncommon Creature — Ouphe card from Lorwyn Eclipsed (ECL), collector number 227. Current market price: $0.13 (foil $0.17), TCGplayer market prices via Scryfall.
Vivid — At the beginning of combat on your turn, another target creature you control gets +X/+X until end of turn, where X is the number of colors among permanents you control.