Frantic Firebolt is a common Instant card from Wilds of Eldraine (WOE), collector number 130. Current market price: $0.26 (foil $0.27), TCGplayer market prices via Scryfall.
Frantic Firebolt deals X damage to target creature, where X is 2 plus the number of cards in your graveyard that are instant cards, sorcery cards, and/or have an Adventure.