Looking at the Challenge results from this weekend, there is only 1 deck with Lavinia in the top8. There are 3 Shops decks.
Is Lavinia making Shops better? There were no Jeskai decks in top 8. Is she cannibalizing the Jeskai decks? Where is BUG and Survival in the meta right now?
Because there are 3 decks.
That's why this format is miserable. Even the 'best' Dredge deck is now universally on 4 Misstep.
That's it. 3 decks. Missteps, Spheres and Outcome. This Vintage challenge has like 2 decks in the top 32 that deviate.
There's the occasional person who puts a Glyph Keeper, a Kaya or some other random 1 or 2 of in his Misstep deck and waves the innovator flag but it's the same play pattern. The Glyph Keeper could have been a Phantom Monster in 95% of games. Same for Shops, somebody plays a Triskelion again and acts like he's invented nuclear fission.
Until Misstep goes expect the same, there's just no room left to build a deck after you've added the Blue Stew (tm), 4 Missteps to Misstep the other Blue guys Missteps. Same with the best core Shop cards, Ravager x 4, etc..