At the beginning of your upkeep, Second Chance triggers, sacrificing itself and causing you to take an extra turn after this one.
In your combat phase, declare any two creatures as attackers.
When you attack, Eiganjo Dynastorian triggers, becoming prepared.
During your second main phase, cast a copy of Replenish from exile by paying {3}{W}, returning Second Chance and any other enchantment cards from your graveyard to the battlefield.
Repeat each extra turn.

Infinite turns

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Eiganjo Dynastorian // Replenish

Second Chance

Cast the non-card copy of the spell from exile by paying its mana cost, unpreparing Eiganjo Dynastorian // Replenish.
When you cast that spell, Spellweaver Helix's last ability triggers, allowing you to cast a copy of the Extra Turn Sorcery without paying its mana cost and take an extra turn after this one.
Resolve the spell from step 1.
Declare at least two creatures as attackers, triggering Eiganjo Dynastorian, preparing it.
Repeat each turn.

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