Lightning Crafter + Molten Echoes + Sling-Gang Lieutenant

Lightning Crafter

Molten Echoes

Sling-Gang Lieutenant

How it works

1. Cast Lightning Crafter by paying 3.
2. Lightning Crafter enters the battlefield, triggering its champion ability and Molten Echoes.
3. Resolve the Molten Echoes trigger, creating a token copy of Lightning Crafter with haste.
4. The Lightning Crafter token enters the battlefield, championing the nontoken Lightning Crafter.
5. Resolve the Lightning Crafter trigger from step 2, choosing not to exile anything.
6. Activate the Lightning Crafter token by tapping it, dealing 3 damage to any target.
7. Activate Sling-Gang Lieutenant by sacrificing the Lightning Crafter token.
8. The Lightning Crafter token leaves the battlefield, returning the nontoken LIghtning Crafter from exile to the battlefield.
9. Repeat from step 2.
10. Resolve all Sling-Gang Lieutenant abilities, causing each opponent to lose infinite life and you to gain infinite life.