mtg modern horizons commander decks 3/Commander Magic The Gathering: Modern Horizons

Contentious Plan

Merchant's Porter : Artifact Creature (Construct), casting cost of one generic mana, 1/2

Counter decks have had a ton of support over the years (including in Streets of New Capenna, where the precon was released alongside), and Bedecked Brokers has many of the best counter cards

Once a host creature has been augmented, it'll no longer be a host creature

Monks rely on combat mechanics and intelligence, and in MTG thats often related to combat abilities and combat keywords

Holding priority, you remove the three counters from the Training Post to copy your next instant or sorcery spell and then go ahead and cast Twincast targeting the Opt and the copy of Twincast copying the original Twincast