Derevi, Empyrial Tactician, Cauldron of Souls, Aerith Gainsborough, and Blasting Station

Prerequisites

• Derevi, Empyrial Tactician on the battlefield
• Cauldron of Souls on the battlefield
• Aerith Gainsborough on the battlefield
• Blasting Station on the battlefield

Steps

1. Activate Cauldron of Souls by tapping it, giving Derevi and Aerith persist until end of turn
2. Activate Blasting Station by tapping it and sacrificing Derevi
3. When Derevi dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it
4. When Derevi enters the battlefield, it and Blasting Station trigger, untapping Cauldron of Souls and Blasting Station
5. Activate Blasting Station by tapping it and sacrificing Aerith
6. When Aerith dies, it triggers twice
7. Resolve Aerith's persist trigger, returning it from your graveyard to the battlefield with a -1/-1 counter on it
8. When Aerith enters the battlefield, Blasting Station triggers, untapping Blasting Station
9. Resolve the second Aerith trigger, putting a +1/+1 counter on each legendary creature you control, thus removing the -1/-1 counters from Aerith and Derevi
10. Resolve the Blasting Station abilities from steps 2 and 5
11. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite damage
• Infinite +1/+1 counters on legendary creatures you control