Mikaeus, the Unhallowed, Cryptic Trilobite, and Altar of Dementia

Prerequisites

• Mikaeus, the Unhallowed on the battlefield
• Cryptic Trilobite on the battlefield
• Altar of Dementia on the battlefield

Steps

1. If Cryptic Trilobite has any +1/+1 counters, activate Cryptic Trilobite's first activated ability until it has no +1/+1 counters, adding that can only be spent to activate abilities each time
2. Activate Altar of Dementia by sacrificing Cryptic Trilobite
3. Cryptic Trilobite's undying ability from Mikaeus triggers, returning Cryptic Trilobite from your graveyard to the battlefield with a +1/+1 counter on it
4. Repeat any number of times
5. Resolve all Altar of Dementia abilities, milling any number of players any number of cards

Results

• Infinite colorless mana that can only be spent on activated abilities
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite mill
• Infinite sacrifice triggers
• Infinite self-mill