Declare Delina and Lightning Runner as attackers, triggering their abilities twice each.
Resolve a Delina trigger, creating at least one token copy of Sage of Shaila's Claim that enters the battlefield tapped and attacking.
The Sage of Shaila's Claim token(s) enters the battlefield, causing you to get at least {E}{E}{E}.
Repeat from step 2 for the remaining Delina trigger.
Resolve the first Lightning Runner trigger, causing you to get {E}{E} and choosing not to pay.
Resolve the second Lightning Runner trigger, causing you to get {E}{E} and pay eight {E} to untap all creatures you control and to get an additional combat phase after this one.
At the end of your combat phase, each creature token created by Delina triggers, exiling themselves.
Repeat each combat phase.
Once you have infinite {E}, you can target different creatures with Delina's triggers.

Infinite combat phases

Infinite copies of creatures you control

Infinite creature tokens

Infinite energy counters

Infinite creature ETB

Infinite creature LTB

Infinite mana creatures you control can produce

Infinite untap of creatures you control

Wulfgar of Icewind Dale

Lightning Runner

Delina, Wild Mage

Sage of Shaila's Claim

Declare Delina and Lightning Runner as attackers, triggering Delina twice and Lightning Runner once.
Resolve a Delina trigger, creating at least one token copy of Sage of Shaila's Claim that enters the battlefield tapped and attacking.
When the Sage of Shaila's Claim token(s) enter the battlefield, they trigger, causing you to get at least {E}{E}{E}.
Repeat from step 2 for the remaining Delina trigger.
Resolve the Lightning Runner trigger, causing you to get {E}{E} and pay eight {E} to untap all creatures you control and to get an additional combat phase after this one.
At the end of your combat phase, each creature token created by Delina triggers, exiling themselves.
Repeat each combat phase.
Once you have infinite {E}, you may target any other creature(s) you control.

Harmonic Prodigy

Declare Lightning Runner as an attacker, triggering its ability.
Holding priority, activate Circle of Dreams Druid by tapping it, adding at least six {G}.
Activate Emiel by paying {3}, blinking Sage of Shaila's Claim.
Sage of Shaila's Claim enters the battlefield, causing you to get {E}{E}{E}.
Repeat from step 3 one additional time.
Resolve the Lightning Runner ability from step 1, causing you to get {E}{E}, then pay eight {E} to untap all creatures you control, and to get an additional combat phase after this one.
Repeat each combat phase.

Emiel the Blessed

Circle of Dreams Druid

Combos with "Sage of Shaila's Claim"