Stalwart Successor, Thunderblust, and Phantom Train

Prerequisites

• Stalwart Successor on the battlefield
• Thunderblust on the battlefield
• Phantom Train on the battlefield

Steps

1. Activate Phantom Train by sacrificing Thunderblust When Thunderblust dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it
2. When Thunderblust enters, Stalwart Successor triggers, putting a +1/+1 counter on Thunderblust Resolve the Phantom Train ability
3. Repeat

Results

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