MTG has had typal cards like Lord of Atlantis or Zombie Master ever since Alpha , but today, typal cards tend to only benefit your creatures when theyre in play
People play that, right
WUBRG decks are always a little tricky to judge if they're not blatantly powerful right out of the box, and because the theming of this deck is so cool, it feels disruptive to try and make upgrades to it, so it's almost a case of being a precon that you shouldn't upgrade, but yet it desperately needs it
Thankfully, over the past decade, even Wizards has realized that partners are pretty broken, and now they avoid printing more cards with the mechanic, instead relying on various partner-with-style mechanics that do something similar but with a much smaller pool of cards to choose from, like how you can partner a Doctor's companion with a Doctor from the Doctor Who set
Other Cards to Include Cursed Merfolk Ursulas Handiwork and Flynn Rider Charming Rogue are good if you prefer a more aggressive playstyle