Sanctum of Ugin [Battle for Zendikar Prerelease Promos] 146 you may spend mana as

you may spend mana as though it were mana of any color to cast it

Set: The Lord of the Rings: Tales of Middle-Earth Commander Type: Legendary Land Rarity: Mythic Boseiju

If the player does

Set: Sun & Moon: Forbidden Light Type: Fighting Rarity: Holo Rare Retreat cost: Colorless

Sanctum of Ugin [Battle for Zendikar Prerelease Promos] 146 you may spend mana asSet: Battle for Zendikar Prerelease Promos Type: Land Rarity: Rare {T}: Add {C}. Whenever you cast a colorless spell with mana value 7 or greater, you may sacrifice Sanctum of Ugin. If you do, search your library for a colorless creature card, reveal it, put it into your hand, then shuffle.