Acererak the Archlich + Carnival of Souls + Urza's Incubator + Diamond Mare

Acererak the Archlich

Carnival of Souls

Urza's Incubator

Diamond Mare

How it works

1. Cast Acererak either from your hand or from the command zone by paying plus commander tax, if applicable.
2. Diamond Mare triggers, causing you to gain life.
3. When Acererak enters, its first ability and Carnival of Souls trigger.
4. Resolve the Carnival of Souls trigger, causing you to add and lose 1 life.
5. Resolve the Acererak trigger, returning it from the battlefield to your hand, and venturing into Lost Mine of Phandelver.
6. Repeat.

This clever loop relies on Acererak the Archlich's clever self-bouncing ETB ability, which triggers whenever it enters the battlefield unless you've completed the Tomb of Annihilation. By choosing Wizard for Urza's Incubator, Acererak's casting cost is reduced down to just a single black mana. Carnival of Souls conveniently refunds that mana whenever Acererak enters, turning the life-loss drawback into a closed loop of black mana to recast him indefinitely. Meanwhile, Diamond Mare sits safely on the battlefield waiting to cushion the life you pay to Carnival of Souls by gaining you life with every single cast of your commander, allowing you to breeze through the Lost Mine of Phandelver over and over again to generate nearly infinite resources.