Horror of the Broken Lands: Limited
That being said, I think its slightly better than Deadly Dispute because it costs one mana instead of two, which can make all the difference in a game
In terms of power loss this list looks fine, it looks like it has a pretty high average power level of cards that operate suitably well together with a nice range of effects and options
While blue is often known for taking extra turns, red doesnt need a whole extra turn just a few extra attacks will often do it
Shortcutting the name of the card can be achieved if the intended card to be named can be sufficiently described such that each player in the game understands the card intending to be named without ambiguity
It turns all nonbasic lands into mountains, which completely shuts down decks that rely on fetches, shocks, or utility lands