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Gleeful Arsonist catches my attention, since it can deal out some serious damage if you can pump its power

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choose 1 "Exosister" monster from your Deck, then take 1 other "Exosister" monster from your Deck that is mentioned on that monster, and Special Summon both, but shuffle them into the Deck during the End Phase, also for the rest of this turn after this card resolves, you cannot Special Summon monsters from the Extra Deck, except "Exosister" monsters

Although this was planned for Amonkhet block Limited, some Standard decks managed to explore these synergies in various ways

The Aura + Venture is going to be good enough for that, and then the completed dungeon bonus makes this far more potent