Sanctum of the Safeguard

{t}: Add one mana of any color. If you do not
control a legendary creature of the chosen color,
add {1} instead.
Legendary creatures you control have "{t}: Add {1}. Activate the ability only to cast legendary creatures spells."
"The Safeguard protected the world from evil hundreds
of years ago. Where are they now, when we need them
most?"