It will include both the cards that are no longer in Standard as well as those that are legal in Standard and will keep adding each new set into the card pool
(2025-06-06) As The Warring Triad enters the battlefield, the number of cards in your graveyard will determine whether any replacement effects that affect creatures entering the battlefield apply to The Warring Triad
What this means is that, should the Troll take lethal damage from something (say from combat, or your opponent casting Pyroclasm), the Troll will stay alive as long as you pump two mana into him
Gardevoir ex [Scarlet and Violet] allows you to attach as many Basic Psychic Energy with its Psychic Embrace Ability and you can use that to power up all of your Psychic Pokemon in play
If my opponent passes with two Islands and a Mountain, I must think about the fact that they might flash in a Reckless Wurm thanks to Frantic Search
Reaching that high of a devotion to green isnt necessarily given, but getting it to 4 or higher is a breeze