Fiery Temper is a special Instant card from Time Spiral Timeshifted (TSB), collector number 62. Current market price: $0.38 (foil $11.10), 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.)