Panic Spellbomb is a common Artifact card from Scars of Mirrodin (SOM), collector number 191. Current market price: $0.12 (foil $0.39), TCGplayer market prices via Scryfall.
{T}, Sacrifice this artifact: Target creature can't block this turn. When this artifact is put into a graveyard from the battlefield, you may pay {R}. If you do, draw a card.