Finale of Eternity is a mythic Sorcery card from War of the Spark Promos (PWAR), collector number 91p. Current market price: $1.77 (foil $3.24), TCGplayer market prices via Scryfall.
Destroy up to three target creatures with toughness X or less. If X is 10 or more, return all creature cards from your graveyard to the battlefield.