Beyond the basic Arcane Signet and Sol Ring, artifacts that produce mana feel wasted in this deck, so it could have gone heavier on card draw, equipment, or vehicles to really power up this strategy
You see, Emiel also has an ability that allows you to pay one White or Green mana to put a +1/+1 counter on your Creatures that enter the battlefield
Prismatic Evolutions is selling out quickly, so The Pokemon Company released a statement on social media announcing that more reprints of this expansion will be sent to stores as soon as possible
March of Swirling Mist is the weakest of these because its constrained by mana or cards, but the fact that the spell actually does something itself, answering things like Collector Ouphe or protecting your creatures, makes it good enough to play
Final Thoughts on Stellar Crown
This can be done if I play Lurrus of the Dream-Den as my companion but want to sideboard a 4-MV card