Leonin Relic-Warder, Rescue Skiff, and Phantom Train

Prerequisites

• Leonin Relic-Warder in hand
• Rescue Skiff on the battlefield
• Phantom Train on the battlefield
• available

Steps

1. Cast Leonin Relic-Warder by paying
2. When Leonin Relic-Warder enters, its first ability triggers, exiling Rescue Skiff
3. Activate Phantom Train by sacrificing Leonin Relic-Warder
4. When Leonin Relic-Warder dies, its second ability triggers, returning Rescue Skiff from exile to the battlefield
5. When Rescue Skiff enters, it triggers, returning Leonin Relic-Warder from your graveyard to the battlefield
6. When Leonin Relic-Warder enters, its first ability triggers, exiling Rescue Skiff
7. Resolve the Phantom Train ability from step 3
8. Repeat from step 3

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite +1/+1 counters on a creature