House of Black and White

Other lands you control have "{t}:Add one mana of
any color to your mana pool."
Temple of the Many-Faced God—{4}{t}: Sacrifice
target creature you control. At the beginning of your next upkeep, create a 2/1 colorless faceless creature token.
"The gift of the Many-Faced God takes myriad
forms, but here it is always gentle."
—Kindly Man to Arya Stark