Urza's Construction Drone 
Artifact Creature — Construct
When Urza's Construction Drone enters, conjure cards named Urza's Mine, Urza's Power Plant, and Urza's Tower into your library, then shuffle. Whenever Urza's Construction Drone attacks or dies, seek an Urza's land card.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyNOT LEGALvintageNOT LEGALcommanderNOT LEGAL