Shilgengar, Sire of Famine, Kithkin Spellduster, and Thran Vigil

Prerequisites

• Shilgengar, Sire of Famine on the battlefield
• Kithkin Spellduster on the battlefield
• Thran Vigil on the battlefield

Steps

1. Activate Shilgengar by sacrificing Kithkin Spellduster
2. When Kithkin Spellduster 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 Kithkin Spellduster
4. Resolve the Shilgengar ability
5. Repeat

Results

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