Impulsive Return is a common Sorcery card from Defeat a God (TDAG), collector number 10. Current market price: $0.40, TCGplayer market prices via Scryfall.
Return two cards named Ecstatic Piper from Xenagos's graveyard to the battlefield. At the beginning of combat this turn, Impulsive Return deals damage to each player equal to the number of Revelers on the battlefield.