Mikaeus, the Unhallowed, Spike Feeder, and Viscera Seer

Prerequisites

• Mikaeus, the Unhallowed on the battlefield
• Spike Feeder on the battlefield
• Viscera Seer on the battlefield
• Spike Feeder has no +1/+1 counters on it

Steps

1. Activate Viscera Seer by sacrificing Spike Feeder
2. Spike Feeder's undying ability triggers, returning itself to the battlefield with a +1/+1 counter on it
3. Resolve the Viscera Seer ability, causing you to scry 1
4. Activate Spike Feeder's second ability three times by removing three +1/+1 counters from it, causing you to gain six life
5. Repeat

Results

• Infinite death triggers
• Infinite ETB
• Infinite lifegain
• Infinite lifegain triggers
• Infinite LTB
• Infinite sacrifice triggers
• Infinite scry 1