Urza's Power Plant

{T}: Add {C}. If you control an Urza's Mine and an Urza's Tower, add {C}{C} instead.

Urza's Mine

{T}: Add {C}. If you control an Urza's Power-Plant and an Urza's Tower, add {C}{C} instead.

Until end of turn, if damage would be dealt to any creature, you may have that damage dealt to you instead.

{T}: Add {C}. If you control an Urza's Mine and an Urza's Power-Plant, add {C}{C}{C} instead.

Mountainwalk (This creature can't be blocked as long as defending player controls a Mountain.)
Protection from white

Whenever City of Brass becomes tapped, it deals 1 damage to you.
{T}: Add one mana of any color.