Oathkeeper, Takeno's Daisho, Shilgengar, Sire of Famine, and Swordsman, Sharp Scoundrel

Prerequisites

• Oathkeeper, Takeno's Daisho on the battlefield
• Shilgengar, Sire of Famine on the battlefield
• Swordsman, Sharp Scoundrel on the battlefield

Steps

1. Activate Shilgengar by sacrificing the creature with changeling
2. When that creature dies, Oathkeeper triggers, returning it from your graveyard to the battlefield
3. When that creature enters, Swordsman triggers, allowing you to attach Oathkeeper to that creature
4. Resolve the Shilgengar ability
5. Repeat

Results

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