Arwen Undómiel, Herd Baloth, and Viscera Seer

Prerequisites

• Arwen Undómiel on the battlefield
• Herd Baloth on the battlefield
• Viscera Seer on the battlefield
• You control at least one additional creature

Steps

1. Activate Viscera Seer by sacrificing another creature, causing you to scry 1
2. Arwen Undómiel triggers, putting a +1/+1 counter on Herd Baloth
3. Herd Baloth triggers, creating a 4/4 Beast creature token
4. Repeat

Results

• Infinite +1/+1 counters on Herd Baloth
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers
• Infinite scry 1