Kiki-Jiki, Mirror Breaker + Lightning Crafter + Panharmonicon

Kiki-Jiki, Mirror Breaker

Lightning Crafter

Panharmonicon

How it works

1. Cast Lightning Crafter by paying 3.
2. When Lightning Crafter enters the battlefield, its champion ability triggers twice.
3. Holding priority, activate Kiki-Jiki by tapping it, creating a token copy of Lightning Crafter with haste.
4. When the Lightning Crafter token enters the battlefield, its champion ability triggers twice.
5. Holding priority, activate the Lightning Crafter token by tapping it, dealing 3 damage to any target.
6. Resolve the first champion trigger, exiling Kiki-Jiki.
7. Resolve the second champion trigger, exiling the Lightning Crafter token.
8. When the Lightning Crafter token leaves the battlefield, it triggers, returning Kiki-Jiki from exile to the battlefield.
9. Repeat from step 3.