Its definitely not coming to you next turn
During each player's turn, that player may play a land or cast a spell from among cards exiled with this enchantment, and they may spend mana as though it were mana of any color to cast that spell
Maze's End Gates are better in Commander with the printing of Baldur's Gate and Gond Gate, but I still think it unlikely that this works outside of Nine-Fingers Keene decks, and honestly, even in those decks
There are other Borderless cards in the set, but I feel its important to go over the math on those and the Movie Posters too
The treasure production proved to be powerful, especially as it was a win condition as well as a way to accelerate
Fatal Fumes: Its more than I want to pay and not as reliable as Id like, but removal is removal