For starters, without a means to give them haste, you have to wait a turn to see any benefit from a mana dork outside of chump blocking, which you arent going to want to do in the early game or in the face of creatures with trample
Set aside 6 cards as Prize cards
Green: Esper Origins - Im thinking of this more as a 4GG card thats a temporary 4/4 that draws a permanent than a 1G card, since its front half is very mediocre and doesnt impact the board (but that may just be too ambitious
This card is all value, and it's costed about as aggressively as it realistically could be
And considering that Palkia ex is also durable and can immediately come out swinging with a 1-energy attack yeah, it's clearly going to be a strong contender, even if it doesn't emerge as the best card
The English set adds three cards from Japanese Gym promo sets Mega Delphox ex (008), Mega Slowbro ex (031) and Jett (079) and cuts Zarude's Illustration Rare, which is the Elite Trainer Box promo instead