10 ex pokemon cards A Holographic History Of The Pokémon TCG: Pokémon-EX but none should be too severe or at too high a volume Pokemon EX Cards - Choose

This character can go toe-to-toe with whatever your opponent throws on the board at such a low cost

If you're able to fill up your deck with cards that have additional triggers when they die, you can chain these abilities turn after turn to keep punishing your opponents until there's nothing left in play

In other words, end of turn effects still happen, but end step triggers do not

It's quite important to make sure this deck is playing Glistening Deluge to answer that deck, and future iterations of this build may want to consider playing cards like Malicious Eclipse if the win rate of that deck continues to increase