Sever the Bloodline is a rare Sorcery card from New Capenna Commander (NCC), collector number 259. Current market price: $0.21, 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.)