Adding 20 cards to your deck seems like a massive drawback that would hamper the consistency of your deck yet Yorion got the ban hammer in several formats, and some Modern decks still tinker with 80 cards, even without the extra creature in their sideboard
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Then, there are decks that can do a lot in the first few turns and then the strategy is to hang on the field for enough time because these decks use all of their resources in one go
You may put that card on the bottom.) Land Land (CTRL to add secondary) Planeswalker Kaya, Geist Hunter +1: Creatures you control gain deathtouch until end of turn
White and black decks can at least remove this, while RG decks are almost comically out of luck (deathtoucher + Chocobo Kick maybe?)
In a follow-up post to X, Pocket s official account stated that it was hearing peoples immediate concerns about how this is all going to work in practice, and encouraged everyone to provide more feedback once the feature is out