Woodfall Primus, Thran Vigil, and Phantom Train

Prerequisites

• Woodfall Primus on the battlefield
• Thran Vigil on the battlefield
• Phantom Train on the battlefield

Steps

1. Activate Phantom Train by sacrificing Woodfall Primus
2. When Woodfall Primus dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it
3. Thran Vigil and Woodfall Primus trigger
4. Resolve the Thran Vigil trigger, putting a +1/+1 counter on Woodfall Primus
5. Resolve the Woodfall Primus trigger, destroying target noncreature permanent
6. Resolve the Phantom Train ability Repeat

Results

• Destroy any number of noncreature permanents
• Infinite +1/+1 counters on a creature
• Infinite ETB
• Infinite LTB
• Infinite death triggers
• Infinite sacrifice triggers
• Lock