The relative power creep disparity between two-prize Pokmon and regular Pokmon has become large enough where if an unrestricted effect like this were to return, it would destroy the format
It gives mass removal options to decks not suitable to run a card that is only mass removal, it gives control in mass removal effect allowing you to play creatures and break the symmetry, or simply respond efficiently to the situation
Still, this archetype seems to struggle to make a strategically cohesive deck, and skilled draft players may be better off drafting something with a clearer identity
This limitation on your opponent can be just the thing you need to come out on top
Sign in Blood is going to have to be good enough for this deck to stay up with Den Protector
More traditional means of card advantage are going to have to be turned to, whether it is planeswalkers or other forms of card draw