Sekki, Seasons' Guide, One with the Kami, and Altar of Dementia

Prerequisites

• Sekki, Seasons' Guide on the battlefield
• One with the Kami on the battlefield
• Altar of Dementia on the battlefield
• One with the Kami attached to any other creature you control
• Sekki has at least eight +1/+1 counters on it

Steps

1. Activate Altar of Dementia by sacrificing Sekki
2. Sekki dies, triggering One with the Kami, creating at least eight 1/1 Spirit creature tokens
3. Resolve the Altar of Dementia ability, causing target player to mill cards equal to Sekki's power
4. Activate Sekki by sacrificing eight Spirits, returning it from your graveyard to the battlefield
5. Repeat

Results

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