Transmogrant Altar is a uncommon Artifact card from The Brothers' War (BRO), collector number 124. Current market price: $0.15 (foil $0.36), TCGplayer market prices via Scryfall.
{B}, {T}, Sacrifice a creature: Add {C}{C}{C}. {2}, {T}, Sacrifice a creature: Create a 3/3 colorless Zombie artifact creature token. Activate only as a sorcery.