This has the potential to get far more mana's worth of value than Arc Trail
This enters the battlefield with a +1/+1 counter for every other ooze you control, so the more storm copies you get, the stronger each one becomes
Archmage Emeritus triggers a draw for every instant or sorcery you cast or copy, which is essential for sustaining the high-mana requirements of the Opus mechanic
With a mill secondary theme to the deck, there are plenty of ways to start putting your opponent's cards in the graveyard
In addition to their toughness, Katana sleeves are also tournament legal by default thanks to their robustly opaque backs and extra clear fronts
Unfortunately, the King has been mostly power crept by Adeline, Resplendent Cathar, so it really is relegated to dedicated cat decks