Perpetual Timepiece is a uncommon Artifact card from Secrets of Strixhaven Commander (SOC), collector number 354. Current market price: $0.68, TCGplayer market prices via Scryfall.
{T}: Mill two cards. (Put the top two cards of your library into your graveyard.) {2}, Exile this artifact: Shuffle any number of target cards from your graveyard into your library.