pokemon shining legends mewtwo collectible cards - - Mewtwo-GX (Full Art) Hyper Rare Basic Pokemon PSA 10 Mewtwo GX 082/072

They'd get a creature on the spot, and the threat to make more, forcing their opponent to come up with two answers rather than one

Gold Mine is a strictly better Gemstone Mine, until it permanently turns into a Wastes, making it interesting to use for all of a three round draft

Youll also get a lot of the ring tempts you triggers as the game goes by, and Sauron with the ring is a powerful force to be reckoned with

As you pointed out, the difference between Pokmon EX and Pokmon GX is that the former ones are always Basic whereas the latter ones are always the stage they are supposed to be [1] (except for Tag Team GX cards which are also always Basic)