Simultaneously, the higher average CMC of the deck and its surprising lack of good non-Artifact mana ramp often leads to many dead cards in ones starting hand, and an often punishing weakness to removal
If you flip a second Illuna, you can add it to hand and then mutate it onto the first one for a double trigger (and no legend rule!) Its harder to see exactly what to do with Vadrok, Apex of Thunder , since one of the best spells in Jeskai to recast Deafening Clarion will also kill Vadrok unless you mutate it under something with better stats
Early event promos with strong provenance
After deciding the what, it was time to discuss the how
Beyond this, we'll continue to explore how we manage the power level portion of matchmaking in a sustainably responsive manner, where changes are regularly accounting for shifts in the metagame but don't impact our ability to run other parts of the game