Trinket Thief

Hideaway, hideaway, hideaway (This creature enters
the battlefield tapped. When it does, look at the top four
cards of your library, exile one face down, then put the
rest on the bottom of your library. Do this process for
each instance of hideaway.)
When Trinket Thief leaves the battlefield, you
may cast any number of artifact spells with
converted mana cost 3 or less that were exiled
with Trinket Thief.