Tarrian's Soulcleaver, Herd Baloth, and Altar of Dementia

Prerequisites

• Tarrian's Soulcleaver on the battlefield
• Herd Baloth on the battlefield
• Altar of Dementia on the battlefield
• You have a way to put a +1/+1 counter on Herd Baloth

Steps

1. Put a +1/+1 counter on Herd Baloth
2. Herd Baloth triggers, creating a 4/4 Beast creature token
3. Activate Altar of Dementia by sacrificing the Beast
4. When the Beast dies, Tarrian's Soulcleaver triggers, putting a +1/+1 counter on Herd Baloth
5. Herd Baloth triggers, creating a 4/4 Beast creature token
6. Resolve the Altar of Dementia ability, causing target player to mill cards equal to the sacrificed creature's power
7. Repeat from step 3

Results

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