For example, its not actually necessary to image an entire card in order to positively identify it
X contains Call for Your Power, which lets you move an Energy attached to one of your Pokmon over to your favorite overpowered dragon (provided he's not affected by a Special Condition) as often as you want before you attack
This card, saddled with the Grass-exclusive Erika, means you can generate 80 HP in one turn
So what if youre not a lifegain deck, or you arent actively spending your life total in black
It's so playable because it's so easy to assemble a game-winning combo with it, from Dramatic Reversal giving you infinite storm count to Narset's Reversal and something like Alrund's Epiphany netting you infinite turns
Green has a ton of synergy with +1/+1 counters, with cards ranging from The Great Henge to Benevolent Hydra bolstering this strategy in recent years