Mikaeus, the Unhallowed, Cryptic Trilobite, and Phyrexian Altar

Prerequisites

• Mikaeus, the Unhallowed on the battlefield
• Cryptic Trilobite on the battlefield
• Phyrexian Altar 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 Phyrexian Altar by sacrificing Cryptic Trilobite, adding
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

Results

• Infinite colored mana
• Infinite colorless mana that can only be used for activated abilities
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers