While controlling an opponent, you can't make any choices or decisions for that player related to tournament rules
"Why should I buy cards that are illegal in every format?" "Very nice proxies!" This reputation stick around for a while, and you could still get a box of CE/IE for around $100 in the early 2000s

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Inquisition is better general disruption than Duress, it has a wider range of targets however Duress hits a much higher % of problem cards
Either way, its rare to see wheels at instant speed, especially at this mana value