Koll, the Forgemaster + Deathrender + Altar of Dementia

Prerequisites

• Deahrender attached to another nontoken creature you control.

Steps

1. 1Activate Altar of Dementia by sacrificing the creature with Deathrender attached.
2. 2When the creature dies, Koll and Deathrender trigger.
3. 3Resolve the Koll trigger, returning the creature from your graveyard to your hand.
4. 4Resolve the Deathrender trigger, putting the creature from your hand onto the battlefield and attaching Deathrender to it.
5. 5Resolve the Altar of Dementia ability from step 1, causing a player to mill cards equal to the creature's power.
6. 6Repeat.

Effects

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