Notably, Solitude can be cast without mana, and that's a powerful effect
Sure you have to be squarely in Elves for it to work, but that justifies the potential two mana to have repeatable populate on the field
For example: Treasure Energy, which can be immediately attached to a Pokemon to provide one Colorless Energy if its a Prize Card that youve just taken
They're not basic, so effects that search for basic lands (such as the ability of a Lander token) can't find them, but they do have the appropriate land types for effects such as that of Willowrush Verge (from the Aetherdrift release)
On average, youre looking at around twelve to fifteen mana from this in the midgame, netting you around ten mana for your troubles
The Apprentice's Folly Credit: Wizards of the Coast Marcy: Take Reflections of Kiki-Jiki, and then make it, uh, bad