Shilgengar, Sire of Famine, and Railway Brawler

Prerequisites

• Shilgengar, Sire of Famine on the battlefield
• Railway Brawler on the battlefield

Steps

1. Activate Shilgengar by sacrificing the persist creature
2. When the persist creature dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it
3. When the persist creature enters, Railway Brawler triggers, putting a number of +1/+1 counters on the persist creature
4. Resolve the Shilgengar ability
5. Repeat

Results

• Infinite Blood tokens
• Infinite ETB
• Infinite LTB
• Infinite death triggers
• Infinite sacrifice triggers