Activate Arm-Mounted Armor's equip ability by paying {0}, targeting Crackdown Construct.
Crackdown Construct triggers, giving itself +1/+1 until end of turn.
Resolve the Arm-Mounted Armor ability, attaching it to Crackdown Construct.
Repeat.

Infinitely large creature until end of turn

Crackdown Construct

Arm-Mounted Anchor

Activate Arm-Mounted Anchor's equip ability by paying {0}, targeting Cephalid Illusionist.
Cephalid Illusionist triggers, causing you to mill three cards.
Resolve the Arm-Mounted Anchor ability, attaching it to Cephalid Illusionist.
Repeat.

Infinite self-mill

Cephalid Illusionist

Activate Arm-Mounted Anchor's equip ability by paying {0}, targeting the affinity creature.
Monk Gyatso triggers, airbending the targeted creature.
The Arm-Mounted Anchor ability fizzles due to no longer having a legal target.
Cast the creature from exile by paying {0} due to its affinity ability.
Repeat.

Infinite LTB

Infinite ETB

Infinite storm count

Creature with Affinity

Monk Gyatso

Activate Arm-Mounted Anchor's equip ability by paying {0}, targeting Cephalid Aristocrat.
Cephalid Aristocrat triggers, causing you to mill two cards.
Resolve Arm-Mounted Anchor's ability, attaching it to Cephalid Aristrocrat.
Repeat.

Cephalid Aristocrat

Activate Arm-Mounted Anchor's equip ability by paying {0}, targeting another nontoken creature you control.
Monk Gyatso triggers, airbending the targeted creature.
The Arm-Mounted Anchor ability fizzles due to no longer having a legal target.
Cast the creature from exile by paying {0} due to Semblance Anvil.
Repeat.

Semblance Anvil

Activate Arm-Mounted Anchor by paying {0}, targeting another nontoken creature you control.
Monk Gyatso triggers, airbending the creature.
Cast the creature from exile by paying {2}.
When the creature enters, Genesis Chamber triggers, creating a 1/1 Myr artifact creature token.
Activate Krark-Clan Ironworks by sacrificing the Myr, adding {C}{C}.
Repeat.

Infinite death triggers

Genesis Chamber

Krark-Clan Ironworks

Activate Arm-Mounted Anchor's equip ability by paying {0}, targeting Priest of Urabrask.
Monk Gyatso triggers, airbending Priest of Urabrask.
The Arm-Mounted Anchor ability fizzles due to no longer having a legal target.
Cast Priest of Urabrask from exile by paying {2}.
When Priest of Urabrask enters, it triggers, adding {R}{R}{R}.
Repeat.

Infinite red mana

Priest of Urabrask

Activate Arm-Mounted Anchor's equip ability by paying {0}, targeting Daru Spiritualist.
Daru Spiritualist triggers, causing itself to get +0/+2 until end of turn.
Resolve the Arm-Mounted Anchor ability.
Repeat an arbitrarily large number of times.
Activate Starlit Sanctum's second ability by paying {W}, tapping it and sacrificing Daru Spiritualist, causing you to gain life equal to Daru Spiritualist's toughness.

Combos with "Arm-Mounted Anchor"