The ability to both draw a card when your stuff is targeted (and before resolution, so you can draw a card to respond to it) and to keep your foes from drawing more than one is very powerful for a 4/4 3-drop that gives you ramp, removal, and countering
These key cards need to be powerful enough to make a high impact on the game
Infernape ex, for example, can do 140 damage for just two Fire Energy, and while it discards both of these on impact, this is still an incredibly powerful and quick move that can one hit knock out all but the strongest ex Pokmon
So, Celebi ex would only need one energy card to attack, and with just two energy cards, it could potentially deal with 200 damage
It also aligns them with other spells of the same mana value
Whether youre a Final Fantasy diehard, a value-minded drafter, or a Commander brewer hunting shiny upgrades, this 64-card gallery is designed to hit every button