Forests and green creatures you control can tap to produce at least ({2} magic symbol) .
Thespian's Stage and Ley Druid do not have summoning sickness.
Steps
Activate all Forests and all mana-producing green creatures you control by tapping them, adding at least ({2} magic symbol) .
Activate Thespian's Stage's second ability by paying ({2} magic symbol) and tapping it, causing it to become a copy of Patron of the Orochi.
Put Patron of the Orochi into your graveyard due to the legend rule.
Activate Ley Druid by tapping it, untapping Thespian's Stage.
Activate Thespian's Stage using Patron of the Orochi's ability by tapping it, untapping all Forests and all green creatures.
Activate all Forests and all mana-producing green creatures you control by tapping them, adding at least ({2} magic symbol) .
Activate Thespian's Stage using its own ability by paying ({2} magic symbol) and tapping it, causing it to become a copy of itself, which causes it to become a copy of Patron of the Orochi.
Repeat from step 4.
If Forests and/or green creatures you control can tap to produce at least ({3} magic symbol) , this combo nets infinite mana.