Requires

Ratchet, Field Medic // Ratchet, Rescue Racer must be on the battlefield. Sculpting Steel must be in hand. Ajani's Welcome must be on the battlefield. Mana needed: plus enough mana to pay for commander tax, if applicable

Steps

1. Cast Sculpting Steel by paying , causing it to enter the battlefield as a copy of Ratchet, Rescue Racer.
2. Put Ratchet into your graveyard due to the legend rule.
3. Choose to return Ratchet to the command zone from your graveyard.
4. Sculpting Steel triggers, failing to convert it.
5. Cast Ratchet from the command zone as Ratchet, Field Medic by paying plus commander tax, if applicable.
6. When Ratchet, Field Medic enters the battlefield, Ajani's Welcome triggers, causing you to gain one life.
7. Ratchet, Field Medic triggers, converting itself.
8. Put Ratchet into your graveyard due to the legend rule.
9. Choose not to return Ratchet to the command zone from your graveyard.
10. Ratchet, Field Medic triggers, returning itself from your graveyard to the battlefield.
11. Repeat from step 6.

Results