I know most of that deck already goes off, but it goes harder
Now you are maybe asking yourself how to identify those legendary Summer Magic cards
Braingeyser Braingeyser still does the work, but as a sorcery that only targets one player
#1 TPCi has released official checklists for Play
For example, if you have psychic Pokemon in your deck, which are weak against dark Pokemon, you could add fighting types to your deck since they're good at battling dark types
2 foil borderless cards (either 2 rare foil borderless cards or 1 rare and 1 mythic rare foil borderless card), 2 foil rares or mythics (2 rare foil regular frame cards or 1 rare and 1 mythic rare foil regular frame card), 8 foil uncommons, 9 foil commons, and 12 full-art basic lands (2 foil and 10 non-foil)