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 Loading Zone, 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 mesmerizing alchemy relies on a clever stacking of replacement effects to fast-track your Sagas. When you transform Terra, Magical Adept into Esper Terra, the combined doubling power of both Innkeeper's Talent and Loading Zone causes the Saga to enter with four lore counters instead of one, instantly triggering its fourth chapter ability. That chapter yields a massive burst of colored mana while exiling and returning Esper Terra to its front face, which then triggers Terra, Magical Adept to mill five cards and potentially recur an enchantment. Because Loading Zone and Innkeeper's Talent double the counters every single time Esper Terra re-enters, the loop becomes self-sustaining and endlessly repeatable.