Florian, Voldaren Scion is a rare Legendary Creature — Vampire Noble card from Innistrad: Double Feature (DBL), collector number 223. Current market price: $0.75 (foil $9.90), TCGplayer market prices via Scryfall.
First strike At the beginning of each of your postcombat main phases, look at the top X cards of your library, where X is the total amount of life your opponents lost this turn. Exile one of those cards and put the rest on the bottom of your library in a random order. You may play the exiled card this turn.