Urza's Tower

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

Urza's Power Plant

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

Prevent all damage that would be dealt by creatures this turn.

Prevent all combat damage that would be dealt this turn.

{1}, {T}, Sacrifice Chromatic Star: Add one mana of any color.
When Chromatic Star is put into a graveyard from the battlefield, draw a card.

Prevent all damage a source of your choice would deal this turn.

{1}, {T}, Sacrifice Chromatic Sphere: Add one mana of any color. Draw a card.

The next time target creature would deal damage this turn, prevent that damage. You gain life equal to the damage prevented this way.

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