Tinker's Alarm System

Flash
When Tinker's Alarm System enters the battlefield, search your library for a construct
card and reveal it. If Tinker, Ezex's Best Toy
was revealed this way, put it onto the battlefield. Otherwise, put that card into your hand. Shuffle.
"Never try to sneak into Ezex's factory, he has
advanced alarm constructs that communicate within
an instant, and in another instant you'll be within
Tinker's sights and on your way to the grave"
- Journal of a deceased thief