mtg commander decks builder [DSK] Duskmourn (5 options) – Common Ground Games Commander Brackets and Game Changers

it could be aggressive, but was also excellent at gaining card advantage and battlefield control, making it much more flexible and adaptable while also being good against other creature decks

Circle of Protection: White seems rather weak against a color designed to destroy enchantments, and many blue decks can take complete control of the game before leisurely bouncing a Circle of Protection: Blue (assuming they aren't just decking you to begin with)

Notably, Vorinclex won't be back on the battlefield yet, so it won't gain the ability either

The strength of Nightmare is the potential value and inevitability of it