Let's say I have an Alakazam MT in play. My opponent uses Cosmic Power and draws - everything is done very fast. I had planned to Power Cancel his Claydol, but he used its power so fast that I didn't get the chance to do it. Would it be too late to protest, or could I have him reverse the effect (take back the bottom two cards, and shuffle the things he had drawed into his deck again, or something similar)? I would guess that it would be too late, but it would be pretty lame - a good Cosmic Power can change the whole game.