Havi, the All-Father, Saffi Eriksdotter, and Blasting Station

Prerequisites

• Havi, the All-Father on the battlefield
• Saffi Eriksdotter on the battlefield
• Blasting Station on the battlefield

Steps

1. Activate Saffi by sacrificing it, targeting Havi
2. When Saffi dies, Havi triggers, returning any legendary creature card with mana value 1 or less from your graveyard to the battlefield
3. Resolve the Saffi ability
4. Activate Blasting Station by tapping it and sacrificing Havi
5. When Havi dies, it and Saffi trigger
6. Resolve the Havi trigger, returning Saffi from your graveyard to the battlefield
7. When Saffi enters the battlefield, Blasting Station triggers, untapping Blasting Station Resolve the Saffi trigger, returning Havi from your graveyard to the battlefield
8. When Havi enters the battlefield, Blasting Station triggers, untapping Blasting Station Resolve the Blasting Station ability from step 4, dealing 1 damage to any target
9. Repeat

Results

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