Explosive Prodigy is a uncommon Creature — Elemental Sorcerer card from Lorwyn Eclipsed (ECL), collector number 136. Current market price: $0.14 (foil $0.29), TCGplayer market prices via Scryfall.
Vivid — When this creature enters, it deals X damage to target creature an opponent controls, where X is the number of colors among permanents you control.