Halvar, God of Battle // Sword of the Realms, Deathrender, Puresteel Paladin, and Altar of Dementia

Prerequisites

• Halvar, God of Battle // Sword of the Realms on the battlefield
• Deathrender on the battlefield
• Puresteel Paladin on the battlefield
• Altar of Dementia on the battlefield

Steps

1. Activate Altar of Dementia by sacrificing the creature with Sword of the Realms and Deathrender attached
2. When the creature dies, Sword of the Realms and Deathrender trigger
3. Resolve the Sword of the Realms trigger, returning the creature from your graveyard to your hand
4. Resolve the Deathrender trigger, putting a creature card from your hand onto the battlefield and attaching Deathrender to it
5. Resolve the Altar of Dementia ability
6. Activate Sword of the Realms by paying , attaching it to the creature that has Deathrender attached
7. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite mill
• Infinite self-mill