Whilst making sure you have a strong core set of Pokmon in your deck these should be complemented with Trainer Cards that are split into categories such as Supporter and Item cards
While there are some diminishing returns with Naban, Dean of Iteration and Snapcaster Mage, since you need mana to cast the spell you flash back from the graveyard, the potential to play a Snapcaster Mage on Turn 4 and flash back a Thoughtseize to take your opponent's best card while also getting to Serum Visions or Thought Scour is pretty appealing
Yuan Shao, the Indecisive ($133) Here's an expensive horsemanship commander, that aids your attackers by forbidding double and multi- blocks
The Monarch is a great subtheme in the deck, and leaning into it a little more with Court of Garenbrig is a great place to start
By turn 3, youre going wide with two Characters on just 5 Don, a tough setup for opponents to handle