Activate Firdoch Core's first ability by tapping it, adding one mana of any color.
Deeproot Pilgrimage triggers. Holding priority, activate Firdoch Core's second ability by paying {4}, causing it to become a 4/4 artifact creature until end of turn.
Resolve the Deeproot Pilgrimage trigger, creating a 1/1 Merfolk creature token.
When the Merfolk enters the battlefield, Intruder Alarm triggers, untapping all creatures.
Activate Firdoch Core's first ability by tapping it, adding one mana of any color.
Deeproot Pilgrimage triggers, creating a 1/1 Merfolk creature token.
Repeat from step 4.

Infinite creature ETB

Infinite colored mana

Infinite creature tokens

Infinite mana creatures you control can produce

Infinite untap of creatures

Intruder Alarm

Deeproot Pilgrimage

Firdoch Core

Cast Firdoch Core by paying {3}.
When Firdoch Core enters, Haru triggers, earthbending Firdoch Core, as it's a land due to Toph.
Activate Zuran Orb by sacrificing Firdoch Core.
When Firdoch Core dies, Haru triggers, returning Firdoch Core from your graveyard to the battlefield.
When Firdoch Core enters, Haru triggers, earthbending Firdoch Core, as it's a land due to Toph.
Resolve the Zuran Orb ability.
Repeat from step 3.

Infinite artifact ETB

Infinite artifact LTB

Infinite artifact sacrifice triggers

Infinite creature LTB

Infinite death triggers

Infinite landfall triggers

Infinite lifegain

Infinite lifegain triggers

Infinite creature sacrifice triggers

Toph, the First Metalbender

Haru, Hidden Talent

Zuran Orb

Cast Firdoch Core by paying {3}.
When Firdoch Core enters, Haru triggers, earthbending Firdoch Core, as it's a land due to Toph.
Activate Oxidda Daredevil by sacrificing Firdoch Core.
When Firdoch Core dies, Haru triggers, returning Firdoch Core from your graveyard to the battlefield.
When Firdoch Core enters, Haru triggers, earthbending Firdoch Core, as it's a land due to Toph.
Resolve the Oxidda Daredevil ability.
Repeat from step 3.

Oxidda Daredevil

Combos with "Firdoch Core"