Viscera Seer, and Cathars' Crusade

Prerequisites

• Viscera Seer on the battlefield
• Cathars' Crusade on the battlefield

Steps

1. Activate Viscera Seer 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, Cathars' Crusade triggers, putting a +1/+1 counter on each creature you control
4. Resolve the Viscera Seer ability
5. Repeat

Results

• Infinite +1/+1 counters on most creatures you control
• Infinite ETB
• Infinite LTB
• Infinite death triggers
• Infinite sacrifice triggers
• Infinite scry 1