Thran Vigil, Yahenni, Undying Partisan, and Obstinate Gargoyle

Prerequisites

• Thran Vigil on the battlefield
• Yahenni, Undying Partisan on the battlefield
• Obstinate Gargoyle on the battlefield

Steps

1. Activate Yahenni by sacrificing Obstinate Gargoyle
2. When Obstinate Gargoyle 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 Obstinate Gargoyle
4. Resolve the Yahenni ability
5. Repeat

Results

• Infinite ETB
• Infinite LTB
• Infinite death triggers
• Infinite sacrifice triggers