My first card game I played was Yu-Gi-Oh
Most of the time, youll be using the first mode on this card which, basically, Polymorphs a creature you have in play into a creature in your hand
It pairs best with haste-granting effects, because then the creatures coming in pump the team and each other and can immediately use the buffs
Even if someone goes to remove this commander, they will take at least six damage doing so, and since youre in Gruul, your deck should be filled to the brim with mana dorks, such as Llanowar Elves, Elvish Mystic, and Sakura-Tribe Elder, to help pay for the commander tax easily
7 Giant Hearth Even though Mewtwo & Mew-GX are Psychic-types, there isn't actually many great EX or GX Pokemon of that type
If you want to try for a 9 or 10, make sure it's worth the hassle