Umori, the Collector + Circuit Mender + Mortuary + Krark-Clan Ironworks

Umori, the Collector

Circuit Mender

Mortuary

Krark-Clan Ironworks

How it works

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