Activate Orthion's second ability by paying ({6} magic symbol) ({R} magic symbol) ({R} magic symbol) ({R} magic symbol) and tapping it, creating five token copies of Verdant Eidolon with haste.
Activate a Verdant Eidolon token by paying ({G} magic symbol) and sacrificing it, adding ({G} magic symbol) ({G} magic symbol) ({G} magic symbol) if it's the first or second token you've sacrificed, or ({R} magic symbol) ({R} magic symbol) ({R} magic symbol) otherwise.
When the Verdant Eidolon token dies, Orthion triggers, untapping itself.
Repeat from step 2 for each remaining Verdant Eidolon token.
Repeat from step 1.
Once you have infinite mana, you may forego sacrificing the Verdant Eidolon tokens and/or target any other creature.
Results
Infinite colored mana.
Infinite copies of creatures you control with haste.