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Morophon, the Boundless Morophon, the Boundless is one of those cards that pretty much any 5-color deck wants to include, at least if its a typal deck

How about Fauna Shaman

Dragonfire Blade is more or less Champions Helm, except it can be equipped for even less, but for the tradeoff of your creature being less hexproof

85+ Trainers Pokmon cards

If you can't find another partner to support Slurrk, you can always pick a partner that allows you to use another color in your deck

(My Equinaut Deck is a deck based around Equilibrium and Fleetfoot Panther that plays and replays creatures with self-bounce triggers to abuse various triggers like Aura Shards, the bounce trigger, or tap them before they had back with Opposition, and so forth)