Creatures you control can tap to produce at least ({1} magic symbol) ({R} magic symbol) .
Steps
Activate all mana-producing creatures you control by tapping them, adding at least ({1} magic symbol) ({R} magic symbol) .
Activate Orthion's first ability by paying ({1} magic symbol) ({R} magic symbol) and tapping it, creating a token copy of any other creature you control with haste.
When the creature token enters the battlefield, Intruder Alarm triggers, untapping all creatures.
Repeat.
If creatures you control can tap to produce at least ({2} magic symbol) ({R} magic symbol) , this combo nets infinite mana.