Herd Baloth, Death's Presence, and Altar of Dementia

Prerequisites

• Herd Baloth on the battlefield
• Death's Presence on the battlefield
• Altar of Dementia on the battlefield
• You control at least one additional creature

Steps

1. Activate Altar of Dementia by sacrificing any other creature
2. Death's Presece triggers, putting a number of +1/+1 counters on Herd Baloth equal to the sacrificed creature's power
3. Herd Baloth triggers, creating a 1/1 Squirrel creature token
4. Resolve the Altar of Dementia ability, causing target player to mill cards equal to the sacrificed creature's power
5. Repeat

Results

• Infinite +1/+1 counters on Herd Baloth
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite mill
• Infinite sacrifice triggers
• Infinite self-mill