Pyromancer's Gauntlet is a rare Artifact card from Magic 2014 (M14), collector number 214. Current market price: $0.35 (foil $0.62), TCGplayer market prices via Scryfall.
If a red instant or sorcery spell you control or a red planeswalker you control would deal damage to a permanent or player, it deals that much damage plus 2 to that permanent or player instead.