If youre playing in one of those higher brackets, there are 3 Game Changers that I recommend prioritizing for this deck
How to play a Pokemon V-Union Once per game during your turn, combine 4 different Pikachu V-Union from your discard pile and put them onto your Bench
Brain Crusher may be lacking in terms of attack power compared to many other level seven monsters, but can be a devastating force when its effect is combined with the effects of other cards
Hes only the second legendary creature that can Threaten (that is, gain control of it temporarily and give it Haste) any opposing creature with an enters trigger, and he gives you so much upside when you do
Without Luminarch Aspirant in the format, the Kodama doesnt really show up anymore and so its price is unlikely to be too severely impacted by rotation
I like a card that can be a fog for you or make your opponents wish they had one