Ratchet, Field Medic // Ratchet, Rescue Racer, Preston, the Vanisher, Ajani's Welcome, and Ephemerate

Prerequisites

• Ratchet, Field Medic // Ratchet, Rescue Racer on the battlefield
• Preston, the Vanisher on the battlefield
• Ajani's Welcome on the battlefield
• Ephemerate in hand
• You have gained at least 2 life this turn
• available

Steps

1. Cast Ephemerate by paying , blinking Ratchet, causing it to enter the battlefield as Ratchet, Field Medic
2. When Ratchet, Field Medic enters the battlefield, Preston and Ajani's Welcome trigger
3. Resolve the Preston trigger, creating a token copy of Ratchet, Field Medic that is a 0/1 Illusion
4. Put the nontoken Ratchet into your graveyard due to the legend rule
5. Choose not to return Ratchet to the command zone from your graveyard
6. When the Ratchet, Field Medic token enters the battlefield, Ajani's Welcome triggers, causing you to gain 1 life
7. The Ratchet, Field Medic token triggers, causing you to convert it into Ratchet, Rescue Racer, and return Ratchet from your graveyard to the battlefield
8. When Ratchet, Field Medic enters the battlefield, Preston and Ajani's Welcome trigger
9. Resolve the Preston trigger, creating a token copy of Ratchet, Field Medic that is a 0/1 Illusion
10. Put the nontoken Ratchet into your graveyard due to the legend rule
11. Choose not to return Ratchet to the command zone from your graveyard
12. The Ratchet, Rescue Racer token triggers, as well as Ajani's Welcome
13. Resolve the Ratchet, Rescue Racer trigger, causing you to convert it into Ratchet, Field Medic
14. Put one of the Ratchet, Field Medic tokens into your graveyard due to the legend rule
15. Resolve the Ajani's Welcome trigger, causing you to gain 1 life
16. Repeat from step 7

Results

• Infinite death triggers
• Infinite ETB
• Infinite lifegain
• Infinite lifegain triggers
• Infinite LTB