I do love the changes made to Prize Fights. It makes me feel more confident going in and I feel like I'm getting more out of it too.
I also like the inclusion of the tier shards. It makes it so that even the most unlucky player can feel like they're getting somewhere in a gatcha style game like this.
Also a plus, Squigly being in Premier Relic, but that goes without saying, haha. She's a delightfully fun character to use. Though having her wind up ability makes me wonder if other characters could benefit from something like that. For instance, Parasoul's napalm tears detonate through her charge attack which leaves you much too vulnerable even in comparison to other Fighter's charge moves. But that's just wishful thinking on my part. It makes Squigly unique right now and fun to use.
On the downside, while I do like the idea of Diamond Tier, the requirements are so insane that players that get it immediately have an almost broken advantage. Now, I can't say I've used a diamond fighter myself as I'm still new to the game, but I feel like getting one would be almost killjoy. My 'That's All Folks' Peacock is already an intense powerhouse and she's still low in level. Yes, you can always just, you know, not use the diamond fighter, but then why get it in the first place. I must be missing something here. Perhaps they are key in this Master Mode.
Finally, I can't say much about Marquee Abilities since, as I previously mentioned, I'm rather new, but it seems like a neat touch for late game players.
Overall, solid update. Cheers~