Midnight Clock is a rare Artifact card from Modern Horizons 3 Commander (M3C), collector number 189. Current market price: $0.36, TCGplayer market prices via Scryfall.
{T}: Add {U}. {2}{U}: Put an hour counter on this artifact. At the beginning of each upkeep, put an hour counter on this artifact. When the twelfth hour counter is put on this artifact, shuffle your hand and graveyard into your library, then draw seven cards. Exile this artifact.