Activate Ashnod's Altar by sacrificing Circuit Mender, adding {C}{C}.
When Circuit Mender dies, its second ability and Mortuary trigger.
Resolve the Mortuary trigger, putting Circuit Mender on top of your library from your graveyard.
Resolve the Circuit Mender trigger, causing you to draw Circuit Mender.
Cast Circuit Mender by paying {2}.
When Circuit Mender enters the battlefield, its first ability triggers, causing you to gain two life.
Repeat.

Infinite death triggers

Infinite draw triggers

Infinite creature ETB

Infinite lifegain

Infinite lifegain triggers

Infinite creature LTB

Infinite creature sacrifice triggers

Infinite storm count

Circuit Mender

Mortuary

Ashnod's Altar

Foundry Inspector

Activate Krark-Clan Ironworks by sacrificing Circuit Mender, adding {C}{C}.
When Circuit Mender dies, its second ability and Mortuary trigger.
Resolve the Mortuary trigger, putting Circuit Mender on top of your library from your graveyard.
Resolve the Circuit Mender trigger, causing you to draw Circuit Mender.
Cast Circuit Mender by paying {2}.
When Circuit Mender enters the battlefield, its first ability triggers, causing you to gain two life.
Repeat.

Krark-Clan Ironworks

Cloud Key

Jhoira's Familiar

Umori, the Collector

Combos with "Circuit Mender"