Activate Marvin using Endrider Catalyzer's ability by tapping it, adding {R}{R}.
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

Endrider Catalyzer

Activate Marvin using Endrider Catalyzer's ability by tapping it, adding {R}{R}.
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 Rex using Endrider Catalyzer's ability by tapping it, adding {R}{R}.
Activate Rex using Pili-Pala's ability by paying {2} and untapping it, adding one mana of any color.
Repeat.

Rex, Cyber-Hound

Activate Lightning Greaves' equip ability by paying {0}, targeting Endrider Catalyzer.
Monk Gyatso triggers. Choose not to airbend Endrider Catalyzer.
Resolve Lightning Greaves' ability, attaching it to Endrider Catalyzer.
Activate Endrider Catalyzer by tapping it, adding {R}{R}
Activate Lightning Greaves' equip ability by paying {0}, attaching it to Monk Gyatso.
Activate Lightning Greaves' equip ability by paying {0}, targeting Endrider Catalyzer.
Monk Gyatso triggers, airbending Endrider Catalyzer.
The Lightning Greaves ability fizzles due to no longer having a legal target.
Cast Endrider Catalyzer from exile by paying {2}.
Repeat.

Infinite ETB

Infinite LTB

Infinite storm count

Monk Gyatso

Lightning Greaves

Activate Endrider Catalyzer by tapping it, adding {R}{R}.
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 Endrider Catalyzer.
Resolve the last Tolarian Kraken trigger, choosing not to pay.
Repeat.

Infinite card draw

Infinite draw triggers

Arcanis the Omnipotent

Tolarian Kraken

Activate Endrider Catalyzer by tapping it, adding {R}{R}.
Activate Sword of the Paruns by paying {1}, untapping Endrider Catalyzer.
Repeat.

Combos with "Endrider Catalyzer"