Cast the creature in your hand by paying its mana cost.
Chulane triggers, causing you to draw a card and put Selesnya Sanctuary from your hand onto the battlefield.
When Selesnya Sanctuary enters, it, Amulet of Vigor and Retreat to Coralhelm trigger.
Resolve the Amulet of Vigor trigger, untapping Selesnya Sanctuary.
Holding priority, activate Selesnya Sanctuary by tapping it, adding due to Nyxbloom Ancient.
Resolve the Selesnya Sanctuary trigger, returning it from your hand to the battlefield.
Resolve the Retreat to Coralhelm trigger, untapping Chulane.
Resolve the creature spell cast in step 1.
Activate Chulane by paying 3 and tapping it, returning the creature from the battlefield to your hand.
Repeat.
This elegant loop turns a simple land bounce into a self-sustaining engine by chaining together Chulane, Teller of Tales and Selesnya Sanctuary. Every time the land drops, Amulet of Vigor ensures it enters ready for action, while Nyxbloom Ancient supercharges its mana production to easily fund Chulane's activation cost. Meanwhile, Retreat to Coralhelm keeps your board untapping smoothly, allowing you to replay your creatures and draw through your entire library.