Oathkeeper, Takeno's Daisho, Blasting Station, and Swordsman, Sharp Scoundrel

Prerequisites

• Oathkeeper, Takeno's Daisho on the battlefield
• Blasting Station on the battlefield
• Swordsman, Sharp Scoundrel on the battlefield

Steps

1. Activate Blasting Station by tapping it and 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 and Blasting Station trigger
4. Resolve the Swordsman ability, allowing you to attach Oathkeeper to that creature
5. Resolve the Blasting Station ability from step 3, untapping it
6. Resolve the Blasting Station ability from step 1, dealing 1 damage to any target
7. Repeat

Results

• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite damage
• Infinite death triggers