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Otherwise, if you only look for the most uninteresting things, it's easier to just play "fool".
Choose a deck for your opponent. Control over the situation is limited (you can only choose one of two options), but there is still some mental challenge involved, albeit to a lesser extent than creating a good deck.
Play well with what you have been given.
This is slightly different from the regular mode and may be worse in some ways, but it's not worth questioning whether it's interesting or not – when everyone picks Sword or another arena top-tier card solely because it's easy to assemble a playable deck, it can't be called "interesting".
I think it's worth playing this mode for variety; it won't be worse.