Twilight City

{t}: Add {u}.
As long as you control 6 or more lands, lands
you control have "{t}: Add one mana of any color."

{w}{u}{b}{r}{g}, {t}, Sacrifce Twilight City: Until
your next turn, your life total can't change and you
gain protection from everything. All permanents you control phase out. (They're treated as though they
don't exist. They phase in before you untap during
your untap step.)