Activate Terra, Magical Adept by paying 4 and tapping it, exiling it and returning it to the battlefield as Esper Terra.
When Esper Terra enters the battlefield with four lore counters on it due to Innkeeper's Talent and Winding Constrictor, its fourth chapter ability triggers, causing you to add , and then exile Esper Terra and return it to the battlefield as Terra, Magical Adept.
When Terra, Magical Adept enters the battlefield, it triggers, causing you to mill five cards and return up to one enchantment card from among them from your graveyard to your hand.
Repeat.
This delightful loop transforms Terra, Magical Adept over and over into Esper Terra, leveraging the explosive counter-multiplying power of Innkeeper's Talent and Winding Constrictor to bypass the Saga's normal pacing entirely. Because both replacement effects trigger when Esper Terra enters with lore counters, it immediately skips straight to its fourth chapter—instantly generating a massive surplus of colored mana while cycling the card back to its front face. As Terra, Magical Adept enters the battlefield anew, its mill and enchantment-recovery trigger refreshes your resources, allowing you to pay the Trance cost and repeat the cycle indefinitely.