Activate Marvin using Orochi Merge-Keeper's ability by tapping it, adding {G}{G}.
Activate Marvin using Pili-Pala's ability by paying {2} and untapping it, adding one mana of any color.
Repeat.

Infinite colored mana

Marvin, Murderous Mimic

Pili-Pala

Orochi Merge-Keeper

Activate Orochi Merge-Keeper by tapping it, adding {G}{G}.
Activate Scryb Ranger by returning it from the battlefield to your hand, untapping Orochi Merge-Keeper.
Cast Scryb Ranger by paying {1}{G}.
Repeat.

Infinite LTB

Infinite ETB

Infinite storm count

Infinite green mana

Infinite landfall triggers

Ashaya, Soul of the Wild

Scryb Ranger

Activate Marvin using Orochi Merge-Keeper's ability by tapping it, adding {G}{G}
Activate Marvin using Farmstead Gleaner's ability by paying {2} and untapping it, putting a +1/+1 counter on Marvin.
Repeat.

Infinite +1/+1 counters on a creature

Farmstead Gleaner

Activate Orochi Merge-Keeper by tapping it, adding {G}{G}.
Activate Arcanis's first ability by tapping it, causing you to draw three cards.
Tolarian Kraken triggers three times. Resolve the first two triggers, causing you to pay {2} to untap Arcanis and Orochi Merge-Keeper.
Resolve the last Tolarian Kraken trigger, choosing not to pay.
Repeat.

Infinite card draw

Infinite draw triggers

Arcanis the Omnipotent

Tolarian Kraken

Activate Orochi Merge-Keeper by tapping it, adding {G}{G}.
Cast Wirewood Symbiote by paying {G}.
Activate Mirror Entity by paying {1}, giving creatures you control all creature types and base power and toughness 1/1 until end of turn.
Activate Wirewood Symbiote by returning it from the battlefield to your hand, untapping Orochi Merge-Keeper.
Repeat.

Wirewood Symbiote

Mirror Entity

Activate Orochi Merge-Keeper by tapping it, adding {G}{G}.
Activate Sword of the Paruns by paying {1}, untapping Orochi Merge-Keeper.
Repeat.

Infinite untap of creatures you control

Infinite mana creatures you control can produce

Sword of the Paruns

Power Artifact

Activate Rex using Orochi Merge-Keeper's ability by tapping it, adding {G}{G}.
Activate Rex using Pili-Pala's ability by paying {2} and untapping it, adding one mana of any color.
Repeat.

Combos with "Orochi Merge-Keeper"