Finale of Revelation is a mythic Sorcery card from War of the Spark Promos (PWAR), collector number 51p. Current market price: $1.33 (foil $7.57), TCGplayer market prices via Scryfall.
Draw X cards. If X is 10 or more, instead shuffle your graveyard into your library, draw X cards, untap up to five lands, and you have no maximum hand size for the rest of the game. Exile Finale of Revelation.