Mikaeus, the Unhallowed, Spike Feeder, and Altar of Dementia

Prerequisites

• Mikaeus, the Unhallowed on the battlefield
• Spike Feeder on the battlefield
• Altar of Dementia on the battlefield
• Spike Feeder has no +1/+1 counters on it

Steps

1. Activate Altar of Dementia 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 Altar of Dementia ability, causing target player to mill cards equal to Spike Feeder's power
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 mill
• Infinite sacrifice triggers
• Infinite self-mill