While untapping permanents to get additional value out of them can be powerful, you still need good permanents to do this in the first place
Theyre functionally the same, but their art usually goes through an update
However, Mew ex can copy any single move of an opponents Active Pokemon for the cost of three Colorless energy
Also to be fair, Ive been completely helpless after one of these hit the battlefield more times than Id like to admit, and as five-color decks get even more popular, I cant imagine the card is going to get worse
Mind you, going back far enough and you would find Phantom Nishoba, Akroma and Visara somewhere on the list
Wrap Up I tried to sum up the different options below to give you an idea of where to go to sell your Magic cards based on a number of different scenarios