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However, some Pokmon attacks, or abilities, and some trainer cards, allow you or instruct you to attach additional energy cards to one or more of your Pokmon

The most known trick with Brainstorm is pairing it with a shuffle effect like a fetch lands ability to shuffle away the cards from your hand you put back on top

Monastery Mentor proved itself to be one of the best finishers in older formats like Vintage, where it's easy to chain together cheap spells and cantrips to potentially make a lethal army of prowess tokens in just a single turn, which is certainly strong but still doesn't really feel broken to me

Instant spell costing 6UU with Delve, allowing graveyard exile for cost reduction

Cards like Magic Drain and Seven Tools of the Bandit are great for just about any deck and the aforementioned Psychic monsters make a huge splash in Chaotic Compliance, adding a ton of new monsters and support