If an effect allows you to search your library for a card with a certain creature type or affects cards with a certain creature type in your graveyard, a card with changeling always fits the bill
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(Each in the mana costs of permanents you control counts toward your devotion to red.) , : Exile Clive, then return it to the battlefield transformed under its owner's control
Across all of my testing with the theme, there are three standout rules to follow for the rest of the deckbuild that gives the Chaos Ritual strategy all it needs to thrive: Every build needs to have at least: 1 non-theme way to get Skull Archfiend of Chaos to the GY without requiring the Normal Summon 1 non-theme way to get 8 Levels of monster(s) to the GY, to banish for your first Ritual Summon, without requiring the Normal Summon 2+ ways to field a Level 7+ Main Deck monster, that doesnt mind being left on board, that you would also like returned to hand
Long story short, The Pokmon Company has its work cut out for it