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Well, in the case of your example, the Bible is elsewhere specific that we must pray in accordance with God's will (James, for example, though I don't remember chapter and verse off the top of my head). Praying in twos doesn't give us a blank check to make ourselves millionaires--however, I have seen some amazing things come out of corporate prayer.

Now, while you are partially correct, let's get to the core of your contention: Exactly where are you seeing Biblical caveats to a believer's authority in Jesus Christ over demons so as to cast them out?

Well, in the case of your example, the Bible is elsewhere specific that we must pray in accordance with God's will...

Then of what use is the promise? "I'll give you anything you want as long as I want to give it to you?"

Praying in twos doesn't give us a blank check to make ourselves millionaires--however, I have seen some amazing things come out of corporate prayer.

And I have seen amazing things not come out of corporate prayer. Again, if Christ's promises are blanket mandates, why are they not supported both logically and experiencially?

...let's get to the core of your contention: Exactly where are you seeing Biblical caveats to a believer's authority in Jesus Christ over demons so as to cast them out?

Not so fast. Your question carries the implicit presumption of the efficacy of the doctrine of Sola Scriptura. I've already pointed out a hole in that reasoning. I think it is incumbent on you to plug that hole before expecting further progress without modifying your premises.