Activate Hargilde by tapping it, adding ({C} magic symbol) ({C} magic symbol) that can only be spent to cast artifact spells or activate abilities of artifacts.
Activate Freed from the Real's second activated ability by paying ({1} magic symbol) , untapping Hargilde.
Repeat.
Results
Infinite colored mana that can only be spent to activate abilities.
Infinite colored mana that can only be spent to cast artifact spells.
Infinite colorless mana that can only be spent to activate abilities.
Infinite colorless mana that can only be spent to cast artifact spells.