Fiery Impulse is a common Instant card from The List (PLST), collector number ORI-145. Current market price: $0.19, TCGplayer market prices via Scryfall.
Fiery Impulse deals 2 damage to target creature. Spell mastery — If there are two or more instant and/or sorcery cards in your graveyard, Fiery Impulse deals 3 damage instead.