Shrine of Limitless Power is a uncommon Artifact card from New Phyrexia (NPH), collector number 154. Current market price: $0.17 (foil $0.45), TCGplayer market prices via Scryfall.
At the beginning of your upkeep and whenever you cast a black spell, put a charge counter on this artifact. {4}, {T}, Sacrifice this artifact: Target player discards a card for each charge counter on this artifact.