Frank's article is five years old now, but fortunately for us, the numbers don't change
It does have quite a few Hisuian Pokemon, including gold versions of Origin Forme Dialga, Palkia, and Arceus, but it also features plenty of Pokemon that arent featured in either game
Unstable Mutation is actually potentially rather funny with Remove Enchantments because you can play an Unstable Mutation on your opponents creature let it get a -1/-1 counter or two, and then return the Mutation to your hand, to play on one of your own creatures
(1) Actively fertilizing his GY is important, placing Springans Brothersin GY will allow him to revive, and placing Springans Brangain GY will allow him to search
In most cases, this is because you managed to knock out one of the stronger Pokemon ex, GX, Vmax, or any other Pokemon with a special ruling