It's possible she'll be an exclusive to BBTS or Walgreens or what have you
On paper, this deck is unstoppable, but it's still very predictable and your opponent will do everything in his power to prevent you from evolving your Gardevoir
Alternatively, in Modern, I would put this in a prison deck in which my opponent was not able to attack with their creatures even if they had them
You could ask: Are you going to attack me this turn? Do you have a counterspell in your hand? Are you able to win the game this turn? If I were to ask you if you concede the game, would your answer to that question be the same as the answer to this question? Spark Fiend is hilarious because its not entirely clear what the card does, why it does it, or how it does it
For this very same reason, having the Pokedex Item Card in hand can become quite handy
If you control a Nissa planeswalker, instead search your library for up to three land cards