Its tied to elemental types like Fire, Water, Grass, Lightning, and Psychic
Card Number / Rarity:033 / Promo Card Type / HP / Stage:Grass / 310 / Stage 2 Card Text:Ability Magic Bouquet You must discard a [G] Energy card from your hand in order to use this Ability
As I once was told this rule of thumb of sorts: if you don't want to see X card in your opening hand, it's better to not run it at 3
6 Yedora, Grave Gardener While she doesnt provide anything in the way of mechanical boosts for your other Treefolk, Yedora does provide a nice flavor boost, letting your fallen Treefolk (and other creatures) live on as Forest lands after their death
Quick caveat the only exception to the rule is the 1 st Edition Base Set Machamp
Cards from the set also won't be legal for competitive play until their official release date, but you may still want to test a few new builds with them before your first competitive event