Trenzalore Clocktower is a rare Legendary Land card from Doctor Who (WHO), collector number 795. Current market price: — (foil $2.14), TCGplayer market prices via Scryfall.
{T}: Add {U}. Put a time counter on Trenzalore Clocktower. {1}{U}, {T}, Remove twelve time counters from Trenzalore Clocktower and exile it: Shuffle your graveyard and hand into your library, then draw seven cards. Activate only if you control a Time Lord.