Sever the Bloodline is a uncommon Sorcery card from Innistrad Remastered (INR), collector number 389. Current market price: $0.20 (foil $0.41), TCGplayer market prices via Scryfall.
Exile target creature and all other creatures with the same name as that creature. Flashback {5}{B}{B} (You may cast this card from your graveyard for its flashback cost. Then exile it.)