Mirrodin

(Seat of the Synod isn't a spell.) {T}: Add {U}.

At the beginning of the end step, if you control no artifacts, sacrifice Glimmervoid. {T}: Add one mana of any color.

Cloudpost enters the battlefield tapped. {T}: Add {C} for each Locus on the battlefield.

{T}: Add {C}. {2}, {T}: Tap target noncreature artifact.

{T}: Add {W}.

{T}: Add {C}. {2}, {T}: Tap target noncreature artifact.

This land enters tapped. {T}: Add {C} for each Locus on the battlefield.

({T}: Add {G}.)

({T}: Add {G}.)

({T}: Add {G}.)

({T}: Add {G}.)

At the beginning of the end step, if you control no artifacts, sacrifice this land. {T}: Add one mana of any color.

{T}: Add {R}.

({T}: Add {U}.)

({T}: Add {U}.)

({T}: Add {U}.)

({T}: Add {U}.)

({T}: Add {R}.)

({T}: Add {R}.)

({T}: Add {R}.)

({T}: Add {R}.)

({T}: Add {W}.)

({T}: Add {W}.)

({T}: Add {W}.)