Nobody had themor if they did, they were in miserable shape
The community widely agrees that in isolation, Greninja ex could be a great card but because of the existence of Dragapult ex , which offers a better version of practically the same effect, there's no need to run it
If you only have a few cards to get rid of, the shipping price may completely null your overall sale
And secondly, Ureni generates value as soon as they enter, and it only gets worse if they're allowed to attack
A Pokemon TCG set usually refers to a main expansion released as part of a generation (like Scarlet & Violet or Sword & Shield)
If you have some extra mana laying around, you can profit when other players make you discard cards, especially when playing against Nekusar EDH decks