Delina, Wild Mage + Lightning Runner + Harmonic Prodigy + Reservoir Walker

Delina, Wild Mage

Lightning Runner

Harmonic Prodigy

Reservoir Walker

How it works

1. Declare Delina and Lightning Runner as attackers, triggering Delina twice and Lightning Runner once.
2. Resolve a Delina trigger, creating at least one token copy of Reservoir Walker that enters the battlefield tapped and attacking.
3. When the Reservoir Walker token(s) enter the battlefield, they trigger, causing you to get at least EEE and gain at least 3 life.
4. Repeat from step 2 for the remaining Delina trigger.
5. Resolve the Lightning Runner trigger, causing you to get EE and pay eight E to untap all creatures you control and to get an additional combat phase after this one.
6. At the end of your combat phase, each creature token created by Delina triggers, exiling themselves.
7. Repeat each combat phase.
8. Once you have infinite E, you may target any other creature(s) you control.

This explosive loop relies on Harmonic Prodigy amplifying the key triggers at the heart of the engine. When Delina, Wild Mage attacks alongside Lightning Runner, the Wizard-buffing presence of Harmonic Prodigy causes Delina's attack trigger to double, allowing you to copy Reservoir Walker multiple times per combat. Each time a Reservoir Walker token enters the battlefield, its energy-generating trigger—again doubled if Harmonic Prodigy happens to touch it, though base generation is plenty—rapidly funds the eight-energy cost required by Lightning Runner to untap your board and grant an additional combat phase. As you cycle through endless extra combats, Delina, Wild Mage can eventually pivot her copies to any other creature on your battlefield once your energy reserves are infinite.