Shilgengar, Sire of Famine, Hardened Academic, and Obstinate Gargoyle

Prerequisites

• Shilgengar, Sire of Famine on the battlefield
• Hardened Academic on the battlefield
• Obstinate Gargoyle on the battlefield

Steps

1. Activate Shilgengar 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. Hardened Academic triggers, putting a +1/+1 counter on Obstinate Gargoyle
4. Resolve the Shilgengar ability
5. Repeat

Results

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