Activate Iron Spider by tapping it, putting a +1/+1 counter on each artifact creature and Vehicle you control.
Activate Crystalline Crawler by removing a +1/+1 counter from it, adding {U}.
Activate Freed from the Real by paying {U}, untapping Iron Spider.
Repeat.

Infinite +1/+1 counters on all Vehicles you control

Infinite +1/+1 counters on certain creatures

Iron Spider, Stark Upgrade

Crystalline Crawler

Freed from the Real

Activate Iron Spider by tapping it, putting a +1/+1 counter on each artifact creature and/or Vehicle you control.
Activate Cryptic Trilobite by removing a +1/+1 counter from it, adding {C}{C} that can only be spent to activate abilities.
Activate Voltaic Construct by paying {2}, untapping Iron Spider.
Repeat.

Voltaic Construct

Cryptic Trilobite

Cast Sol Ring by paying its mana cost.
When Sol Ring enters, Surge Conductor triggers, putting one +1/+1 counter on Arcbound Reclaimer and at least two additional artfacts you control.
Activate Sol Ring by tapping it, adding mana.
Activate Krark-Clan Ironworks by sacrificing Sol Ring, adding {C}{C}.
Activate Arcbound Reclaimer by removing a +1/+1 counter from it, putting Sol Ring from your graveyard on top of your library.
Activate Iron Spider's last ability by paying {2} and removing two +1/+1 counters from artifacts you control, drawing Sol Ring.
Repeat.

Infinite colorless mana

Infinite draw triggers

Infinite proliferate

Infinite storm count

Infinite artifact ETB

Infinite artifact LTB

Infinite artifact sacrifice triggers

Arcbound Reclaimer

Krark-Clan Ironworks

Sol Ring

Surge Conductor

Activate Iron Spider by tapping it, putting a +1/+1 counter on each artifact creature and/or Vehicle you control.
Activate Workhorse and Crystalline Crawler by removing a +1/+1 counter from each of them, adding {1}{C}.
Activate Voltaic Construct by paying {2}, untapping Iron Spider.
Repeat.

Workhorse

Cast Sol Ring by paying its mana cost.
When you cast that spell, Inexorable Tide triggers, putting one +1/+1 counter on Arcbound Reclaimer and at least two additional artifacts you control.
Activate Sol Ring by tapping it, adding mana.
Activate Krark-Clan Ironworks by sacrificing Sol Ring, adding {C}{C}.
Activate Arcbound Reclaimer by removing a +1/+1 counter from it, putting Sol Ring from your graveyard on top of your library.
Activate Iron Spider's last ability by paying {2} and removing two +1/+1 counters from artifacts you control, drawing Sol Ring.
Repeat.

Inexorable Tide

Combos with "Iron Spider, Stark Upgrade"