Ray of Command

Untap target creature an opponent controls and gain control of it until end of turn. That creature gains haste until end of turn. When you lose control of the creature, tap it.
"Controlling a dragon's power is no small feat and comes with numerous risks when done for long periods of time. Fortunately, dragons are very efficient when it comes to destruction-I probably won't need to control it for very long."
-Urza