Blightbeetle, Phantom Train, and Coveted Falcon

Prerequisites

• Blightbeetle on the battlefield
• Phantom Train on the battlefield
• Coveted Falcon on the battlefield
• available

Steps

1. Activate Coveted Falcon by paying , turning it face up
2. Coveted Falcon triggers, causing an opponent to gain control of Blightbeetle and causing you to draw a card
3. Activate Phantom Train by sacrificing the undying creature
4. When the undying creature dies, its undying ability triggers, returning itself from your graveyard to the battlefield without a +1/+1 counter on it due to Blightbeetle
5. Resolve the Phantom Train ability
6. Repeat from step 3

Results

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