Yeah, it's a good strategy to do in some cases. Sometimes with a little thinking outside the box, you can do some pretty funny things. I've used Quintessence on opponent's unbuffed dune scorpions, for example, to prevent them ever becoming buffed. The funniest one I've done (and I do it all the time now) was the day when I had PAed my quantum tower stack, then tried to use a nymph queen on it, and realized I'd just screwed my nymph queen. Then I realized... holy crap, Jezebel counter... lol.