Tithing Blade // Consuming Sepulcher

When this artifact enters, each opponent sacrifices a creature of their choice.Craft with creature {4}{B} ({4}{B}, Exile this artifact, Exile a creature you control or a creature card from your graveyard: Return this card transformed under its owner's control. Craft only as a sorcery.)At the beginning of your upkeep, each opponent loses 1 life and you gain 1 life.