Cast Legolas's Quick Reflexes by paying {G}, targeting Cacophodon.
Activate Cacophodon by tapping it.
Cacophodon triggers, dealing damage equal to its power to itself.
Cacophodon triggers, untapping itself.
Resolve the Cacophodon ability from step 2.
Repeat from step 2.

Infinite damage

Cacophodon

Legolas's Quick Reflexes

Hankyu

Activate Hankyu by tapping Gilder Bairn, producing its effect.
Activate Gilder Bairn by paying {2}{G/U} and untapping it, doubling each counter on Crystalline Crawler.
Activate Crystalline Crawler as many times as necessary by removing counters from it, adding at least three mana.
Repeat from step 2.
Once you have infinite counters on Crystalline Crawler, you may instead double the counters on any other permanents.

Infinite colored mana

Infinite proliferate for permanents

Infinite +1/+1 counters on a creature

Gilder Bairn

Crystalline Crawler

Activate Warchanter Skald using the first Hankyu ability by tapping it.
Warchanter Skald triggers, creating a 2/1 Dwarf Berserker token.
Intruder Alarm triggers, untapping all creatures.
Resolve the Warchanter Skald activated ability, putting an aim counter on Hankyu.
Repeat any number of times.
Activate Warchanter Skald using the other ability granted by Hankyu, removing all aim counters and dealing that much damage to an opponent.
Repeat.

Infinite creature tokens

Infinite death triggers

Infinite creature ETB

Infinite creature LTB

Infinite untap of creatures

Infinite mana creatures you control can produce

Warchanter Skald

Intruder Alarm

Activate Pestered Wellguard by tapping it.
Pestered Wellguard triggers, creating a 1/1 Faerie creature token.
When the Faerie enters, Intruder Alarm triggers, untapping all creatures.
Resolve the Pestered Wellguard ability from step 1.
Repeat

Pestered Wellguard

Activate Emmara by tapping it.
Emmara triggers, creating a 1/1 Human Warrior creature token.
When the Human Warrior enters the battlefield, Intruder Alarm triggers, untapping all creatures.
Resolve the Emmara ability from step 1, putting an aim counter on Hankyu.
Repeat.
Once Hankyu has infinite aim counters, you may use Emmara to deal infinite damage to any target(s).

Combos with "Hankyu"