Incorrect rules interactions
Opposition agent + scheming symmetry doesn’t work properly. I tried with Sparky and in a normal game. I control the opponent while they are searching but I can’t exile the card, I can only put it on top of his library.
It is absolutely a bug.
Rules on scryfall for opposition agent: The cards found in the search will be exiled rather than be put wherever the spell or ability tells the opponent to put them after finding them. Any other effects the spell or ability has will still apply. If such an effect refers to the found cards, it can't see them in exile. (2020-11-10)
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Doom and Gloom#31293
commented
Yep, this definitely seems like a bug, wonder why is it not fixed yet? Just crafted the agents for this