Viscera Seer, Thran Vigil, and Persistent Constrictor

Prerequisites

• Viscera Seer on the battlefield
• Thran Vigil on the battlefield
• Persistent Constrictor on the battlefield

Steps

1. Activate Viscera Seer by sacrificing Persistent Constrictor
2. When Persistent Constrictor dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it
3. Thran Vigil triggers, putting a +1/+1 counter on Persistent Constrictor
4. Resolve the Viscera Seer ability
5. Repeat

Results

• Infinite ETB
• Infinite LTB
• Infinite death triggers
• Infinite sacrifice triggers
• Infinite scry 1