I think it would likely do good work for suppressing incentives to play fast combo while giving extra value to fair decks that arent nearly as hurt by it
Still, even if The Magic Mirror isn't leagues ahead of the competition, it's still a very solid option for any Spellslinger deck, especially any deck that mixes in some artifact, perhaps cheating it into play with a Goblin Welder or similar effect
1 | Icetill Explorer Mana Value: 2GG Type: Creature Insect Scout Rarity: Rare Card Text: You may play an additional land on each of your turns
Theyre awful, and I wish theyd stop putting them in precons
This allows for some potentially infinite loops if set up right, as well as plenty of power plays by making use of creatures that activate when they enter the battlefield
Each Conspiracy and Conspiracy: Take the Crown booster box has the standard 36 packs