Declare Delina and Lightning Runner as attackers, triggering their abilities twice each.
Resolve a Delina trigger, creating at least one token copy of Multiform Wonder that enters the battlefield tapped and attacking.
The Multiform Wonder 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 ETB

Infinite LTB

Infinite mana creatures you control can produce

Infinite untap of creatures you control

Isshin, Two Heavens as One

Lightning Runner

Delina, Wild Mage

Multiform Wonder

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 Multiform Wonder that enters the battlefield tapped and attacking.
When the Multiform Wonder 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

Wulfgar of Icewind Dale

Cast Multiform Wonder by paying {0}.
Multiform Wonder enters the battlefield, causing you to gain {E}{E}{E}.
Activate Multiform Wonder's third ability twice by paying {E}{E}, giving Multiform Wonder +4/-4 until end of turn.
Multiform Wonder dies as a state-based action due to having less than zero toughness.
Enduring Renewal triggers, returning Multiform Wonder from your graveyard to your hand.
Repeat.

Infinite death triggers

Infinite storm count

Mycosynth Golem

Enduring Renewal

Cast Greenbelt Rampager by paying 2 life.
Defiler of Vigor triggers, putting a +1/+1 counter on each creature you control.
Activate Spike Feeder's second ability by removing a +1/+1 counter from it, causing you to gain two life.
Greenbelt Rampager enters the battlefield, returning itself from the battlefield to your hand and causing you to get {E}.
Activate Multiform Wonder's first ability by paying {E}, giving it lifelink until end of turn.
Repeat.

Infinite +1/+1 counters on all creatures you control except Spike Feeder

Defiler of Vigor

Spike Feeder

Greenbelt Rampager

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 Multiform Wonder.
Multiform Wonder 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

Cast Multiform Wonder by paying {0}.
Animar triggers, putting a +1/+1 counter on itself.
Multiform Wonder enters the battlefield, causing you to gain {E}{E}{E}.
Activate Multiform Wonder's third ability twice by paying {E}{E}, giving Multiform Wonder +4/-4 until end of turn.
Multiform Wonder dies as a state-based action due to having less than zero toughness.
Enduring Renewal triggers, returning Multiform Wonder from your graveyard to your hand.
Repeat.

Infinite +1/+1 counters on Animar

Animar, Soul of Elements

Combos with "Multiform Wonder"