mtg commander decks march of the machines Machine Deck Set sided token Magic: The Gathering March of

Well, the fact that a pretty decent chunk of the time you wont be able to cast it for any sort of value

4 Kindred Dominance It's no secret that effective board wipes are a cornerstone of the Commander format, allowing you to remove a wide array of problematic permanents from play with a single card

With Mockingbird you get the upside of a flying clone, and its wording means you're always spending a net-even amount of mana compared to the creature you copy

Expensive creatures like your typical Dragon love being cheaper, though

Bloodletter of Aclazotz Speaking of Sheoldred

With Day of Judgement back in Standard, creature-based decks will have a tough time finding a foothold for quite some time