Based on the example on this thread:
viewtopic.php?t=57486
Could you instead search and fail to find? How is that verfiable in a tournament setting, if you are forced to attempt to play a card when there is one in your deck?
The same could be applied to other cards as well. For example, Regions of Rokugan goes off. I have regions in play, and one region left in my deck that I really want to stay in play, and my opponent has Bay of Green Coral. Can I search my deck and "fail" to find my one remaining region (hoping, say that my opponent uses Bay of Green Coral on one of my regions already in play)? Or if I chose to search, do I have to put a region in play?