Kk. I'll define the feat so you'll know exactly what to look for.
In episode 46, during her card fight, Misaki rode a Grade 3 Unit called CEO Amaterasu.
Now the notable feat here is this and it should be safe to consider unlike the hyperbole above:
When Misaki rode Amaterasu, upon her summoning to the field, she summoned a decently sized sun above her with just her ride alone. Now of course, this is not a real sized sun or else everything on Planet Cray would have been destroyed or burnt to a crisp. However, it was also not some tiny small sun like the one Father made from FMA. It seemed to be a decently large one. Now this may need a calc but depending on what the results are, it might given them an even more better boost. But i'll let you see the episode yourself first.
And now i'll report what I watched from Kai and Rens fight:
Honestly there wasnt very much new stuff that came up in the fight. However we did get 2 things out of it:
The first is, Kai and Ren both used the evolved form of their units. For Kai he used Dragonic Overlord The End and for Ren he used Phantom Blaster Overlord. There the evolved forms of Dragonic Overlord and Phantom Blaster Dragon so these new forms should be scaled a little higher than their lower forms.
And the second thing that we got was they used a new skill called a Persona Blast. Though im not exactly sure what it does.
And.....thats it. Bummer
Though the finals between Q4 and Asteroid should be promising for some feats so lets hang on.