Mischievous Quanar and Chromatic Orrery on the battlefield (Mischievous Quanar face down).
Opponents control at least eight tapped lands.
({8} magic symbol) available.
Steps
Cast Mana Geyser by paying ({5} magic symbol) .
Holding priority, activate Mishchievous Quanar's morph ability by paying ({3} magic symbol) , turning it face up.
Mischievous Quanar triggers, copying Mana Geyser.
Resolve the copy of Mana Geyser, adding ({1} magic symbol) for each tapped land your opponents control.
Activate Mischievous Quanar's first ability by paying ({5} magic symbol) , turning it face down.
Repeat from step 2.
If opponents control nine or more tapped lands, this combo nets infinite mana, which you can then use to activate Mischievous Quanar to get infinite copies of any other instant and/or sorcery spell(s) on the stack.
Results
Infinite colored mana.
Infinite copies of any instants and/or sorceries on the stack.