Patches, Caravan Captain

Stealth (This creature can't be blocked as long as it attacks alone or only with other creatures that have stealth.)
Sneak Attack (Whenever this creature deals combat damage to a player, surveil 1.)
Whenever you surveil three or more cards at once, you may search your library for a Servo artifact creature card with mana value X or less, where X is the number of cards surveilled this way. Put that card onto the battlefield, then shuffle.