Sanctum of Ugin is a rare Land card from Battle for Zendikar Promos (PBFZ), collector number 242s. Current market price: — (foil $13.91), TCGplayer market prices via Scryfall.
{T}: Add {C}. Whenever you cast a colorless spell with mana value 7 or greater, you may sacrifice this land. If you do, search your library for a colorless creature card, reveal it, put it into your hand, then shuffle.