2011-09-22 : If any of the named cards stops being an artifact, it won’t be considered by these abilities.

2011-09-22 : If you control artifacts named Scepter of Empires and Throne of Empires, the targeted creature won’t be tapped. You’ll just gain control of it.

2011-09-22 : Whether or not you control the correct artifacts is determined when the ability resolves.