Wonderscape Sage does not have summoning sickness.
You control at least one mana-producing land.
Steps
Activate the mana-producing land by tapping it, adding at least ({1} magic symbol) .
Activate Wonderscape Sage by tapping it and returning the mana-producing land from the battlefield to your hand, causing you to draw a card and discard a card if the land didn't have a nonbasic land type.
Activate Patron of the Moon by paying ({1} magic symbol) , putting the mana-producing land from your hand onto the battlefield untapped due to Spelunking.
When the land enters the battlefield, Retreat to Coralhelm triggers, untapping Wonderscape Sage.