Sidisi, Regent of the Mire, Karmic Guide, Thornbite Staff, and Phantom Train

Prerequisites

• Sidisi, Regent of the Mire on the battlefield
• Karmic Guide in the graveyard
• Thornbite Staff on the battlefield
• Phantom Train on the battlefield

Steps

1. Activate Sidisi by tapping it and sacrificing the creature with mana value 4
2. When the creature dies, Sidisi triggers, untapping Sidisi
3. Resolve the Sidisi ability, returning Karmic Guide from your graveyard to the battlefield
4. When Karmic Guide enters the battlefield, it triggers, returning the creature with mana value 4 from your graveyard to the battlefield
5. Activate Phantom Train by sacrificing Karmic Guide
6. When Karmic Guide dies, Sidisi triggers, untapping Sidisi
7. Resolve the Phantom Train ability
8. Repeat

Results

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