In general, I agree with the voices that say that Universes Beyond has gone a bit too far, with too many releases and too many crossovers happening
Theres no way of quantatively ranking which cards with side effects are the most powerful, as they all have unique benefits when played against opponents
If you have items you want back in your hand, Tamatoa can fetch two of them from the discard when you play it
The basic idea is to use abilities like Vivi Ornitiers to deal your opponent 1 damage whenever you cast a noncreature spell and then start slinging noncreature spells like its going out of style
If that ends up being the case, congratulations
Yet, the original elixir was only borderline playable in Limited, and Elixir looks a lot worse to me