Fiery Temper is a common Instant card from Ultimate Masters (UMA), collector number 129. Current market price: $0.27 (foil $0.36), TCGplayer market prices via Scryfall.
Fiery Temper deals 3 damage to any target. Madness {R} (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)