Dross Scorpion, Detective's Satchel, and Phantom Train

Prerequisites

• Dross Scorpion on the battlefield
• Detective's Satchel on the battlefield
• Phantom Train on the battlefield

Steps

1. Activate Detective's Satchel by tapping it, creating a 1/1 Thopter artifact creature token
2. Activate Phantom Train by sacrificing the Thopter
3. When the Thopter dies, Dross Scorpion triggers, untapping Detective's Satchel
4. Resolve the Phantom Train ability
5. Repeat

Results

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