Your Mono-Black deck having issues with Esikas Chariot
Huey, Dewy, and Louie all have the Support feature, which can give Scrooge a much higher strength, allowing him to be successful in his challenges
Our proxy can be used for kitchen table magic, a proxy for deck testing, and act as additional copies of those expensive cards that you already own, players who looking for alter art of a card that they like or to use as their Commander, cube, EDH / CEDH games with friends who welcome proxies
With Mirari, Cunning Wish could copy itself and get back another Cunning Wish plus a sideboard card, leading many games to end in a fury of Elephant and Spirit tokens via Mirari and it's Mirari's Wake
For that reason, its best to think of this as an inherent weakness that cant be fixed
I don't get to play too often but I have the feeling that the decks are a bit unfocused which could be due to player drafting skill but for sure the main contributor is a somewhat unfocused cube