Circuit Mender + Mortuary + Krark-Clan Ironworks + Foundry Inspector

Circuit Mender

Mortuary

Krark-Clan Ironworks

Foundry Inspector

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.

This elegant loop hinges on Mortuary quietly intercepting Circuit Mender every time it hits the graveyard, neatly placing the automaton back on top of your library instead of letting it rest. From there, the two generic mana generated by sacrificing it to Krark-Clan Ironworks is funneled directly back into recasting the robot, a cost heavily cushioned by Foundry Inspector reducing its price to a mere two generic mana. As the loop cycles infinitely, Circuit Mender's leaving-the-battlefield trigger draws you the card you just tucked, while its entering-the-battlefield ability floods you with endless life.