As for the main set, one of the main new mechanics was saga creatures
Teamwork The Teamwork mechanic falls into the category of things like Convoke or Improvise, in which you can tap permanents you control as an additional cost to casting the spell in order to enhance it
Togepi & Cleffa & Igglybuff: Alternate Art Promos (Promo) $232.43 A Three For One While you may not expect how valuable baby Pokemon cards can be, this striking Alt Art Promo featuring Togepi, Igglybuff, and Cleffa will completely change your view of valuable baby Pokemon cards
In season four, episode #34, "Fighting for a Friend Pt
Forest of Giant Plants: XY - Ancient Origins and Wally: XY -Roaring Skies Forest of Giant Plants, when it was around, almost guaranteed that grass decks would be the only viable options in the Pokmon TCG