Old-Growth Troll bug
When enchanting a forest with two trolls, Arena doesn't allow it to be tapped with the extra mana-adding ability the troll allows
Wood Elf#69115 commented
Re: "Sometimes for no reason when a forest is double enchanted clicking the ability exits the menu and adds no mana nor taps...". I see this consistently with the Old-Growth Troll aura, not just sometimes.
No Rezzahan, he's talking about the tap GG ability ceasing to function altogether. Sometimes for no reason when a forest is double enchanted clicking the ability exits the menu and adds no mana nor taps, making the extra mana ability impossible.
[Deleted User] commented
If you are refering to you not being able to cast the Cityscape Leveler, that is correct so, because you only have 7 mana total available. The enchanted Forest taps for two mana, which lets you activate Nykthos for 6, and then your other Forest adds one more. The enchanted land does not produce more mana with more Old-Growth Trolls on it, it just gets more (and redundant) instances of "tap for two mana".