You've Activated My Trap Card

If you have less than five face down cards on the battlefield, put the top cards of your library into
the battlefield face down until you have five.
You may look at face down cards you control at anytime.
Until your next turn, whenever an opponent
casts a spell that targets you or a permanent you control or whenever one or more creatures
attacks you, you may reveal a face down card, if
it's a a nonland card, put it on the stack.
Epic