2016-09-20 : Any abilities that trigger as the artifact enters the battlefield aren't put onto the stack until Madcap Experiment is done resolving.

2016-09-20 : If you don't reveal an artifact card, you'll randomize your library and be dealt damage equal to the number of cards in your library.

2016-09-20 : Once Madcap Experiment begins resolving, no player may take any actions other than those specified by Madcap Experiment until it's done resolving.

2016-09-20 : The number of cards revealed this way includes the artifact card you put onto the battlefield.