I think Intercessor's Arrest is better than regular arrest if you actually have any vehicles.

The Cantrip creatures are obviously a huge fucking slam dunk no brainer

Oath is similarly a no brainer, huge finisher potential, very splashable for UR as a finisher.

Cathar Commando could be left out potentially if you like other effects that do that better

Plainscycle Samurai is obviously goated.