Quote from The_FPS »Doesn't this only partially hose tron as the other lands still see Urza's Tower on the battlefield and still produce 2? The tower would loze it's type and ability but not it's name, otherwise this enchantment would stop working. So an opponent would still have 5 mana with tron and you would just color fix any spells they have like nature's claim. This just seems bad compared to blood moon.
The Tron lands work by land sub-type and not name. Urza's Tower has the subtype Urza's Tower which it loses with this land so this will break up Tron entirely.