Activate Terra, Magical Adept by paying 4 and tapping it, causing you to exile it and return it to the battlefield as Esper Terra.
As Esper Terra enters the battlefield, choose to have it enter with four lore counters due to its read-ahead ability.
Esper Terra's 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 put up to one enchantment card milled this way into your hand.
Repeat.
This dazzling infinite loop transforms a modest magical adept into a mana-generating engine by exploiting the clever synergy of its dual sides and a temporal history teacher. With Barbara Wright: History Teacher granting read ahead to your Sagas, Esper Terra can bypass its early chapters entirely to immediately trigger its fourth chapter upon entry. That final chapter yields a massive windfall of ten colored mana—more than enough to fund the exact transformation cost required to loop back into Terra, Magical Adept via its Trance ability. Meanwhile, Shang-Chi, Master of Kung Fu assists by letting you tap right away for creature mana and instantly bypass summoning sickness with his haste-granting prowess, ensuring the engine can fire repeatedly.