: Add . If you control an Urza's Power-Plant and an Urza's Tower, add instead.
Tap to add 1 colorless mana to your mana pool. If you have Urza's Mine, Urza's Tower, and Urza's Power Plant in play at the same time, tap to add 2 colorless mana to your mana pool.
Mines became common as cities during the days of the artificers.
