If you just want to benefit a player then Inspiration, Secret Rendezvous, and Huddle Up can do just that and get you some card draw as well
While proving that cards can come off of the Reserved List is a big deal in and of itself, perhaps more important is the reason: Wizards stated, in black and white, that community support for the change made it happen
You can only use this effect of "Subterror Behemoth Fiendess" once per turn
There's one Partner With card for each of the five allied colour pairs: one Azorius (white and blue), one Dimir (blue and black), one Rakdos (black and red), one Guul (red and green), and one Selesnya (green and white)
Like the other Mitama monsters, it's useful for Xyz Summoning a Rank 4 monster or a Link Monster to maintain field presence
While Arceus isn't optimized for Nintendo Switch 2, it's still such a great game