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 Vorinclex 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 loop turns Esper Terra into a self-sustaining mana and trigger engine by weaponizing replacement effects. With Loading Zone and Vorinclex, Monstrous Raider both active on your board, any counters placed on Esper Terra are doubled twice—allowing its final chapter to immediately trigger upon entry, generating a massive influx of colored mana while cycling it back to its front face. When Terra, Magical Adept re-enters the battlefield, its triggered ability mills your library and lets you recur any enchantment you need, before you pay the Trance cost to restart the cycle.