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 Vorinclex, 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 dazzling loop turns Terra, Magical Adept's backside Saga—Esper Terra—into a self-sustaining mana and transformation engine by weaponizing counter multipliers. When Esper Terra enters the battlefield, the replacement effects from both Vorinclex, Monstrous Raider and Innkeeper's Talent (at level 3) double the lore counters placed upon it, instantly skipping straight to chapter IV. That final chapter yields a massive windfall of ten colored mana while cycling Esper Terra right back to its front face as Terra, Magical Adept, whose enter-the-battlefield trigger then mills five cards and restocks your hand with an enchantment. You can simply pay the transformation cost again to restart the whole cycle, continuously harvesting mana, triggering enter-and-leave-the-battlefield abilities, and churning through your deck.