Sanctum of Ugin is a rare Land card from Battle for Zendikar (BFZ), collector number 242. Current market price: $2.07 (foil $11.57), 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.