Havi, the All-Father, Sakashima the Impostor, and Blasting Station

Prerequisites

• Havi, the All-Father on the battlefield
• Sakashima the Impostor on the battlefield
• Blasting Station on the battlefield

Steps

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

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite damage
• Put all legendary creature cards with mana value 5 or less from your graveyard onto the battlefield