Othelm, Sigardian Outcast, Deep Forest Hermit, Intruder Alarm, and Ashnod's Altar

Prerequisites

• Othelm, Sigardian Outcast on the battlefield
• Deep Forest Hermit on the battlefield
• Intruder Alarm on the battlefield
• Ashnod's Altar on the battlefield
• Othelm does not have summoning sickness

Steps

1. Activate Ashnod's Altar by sacrificing Deep Forest Hermit, adding
2. Activate Othelm by paying and tapping it, returning Deep Forest Hermit from your graveyard to the battlefield tapped
3. Deep Forest Hermit enters the battlefield, triggering itself and Intruder Alarm
4. Resolve the Intruder Alarm trigger, untapping all creatures
5. Resolve the Deep Forest Hermit trigger, creating four 1/1 Squirrel creature tokens
6. The Squirrel tokens enter the battlefield, triggering Intruder Alarm four times, untapping all creatures
7. Repeat

Results

• Infinite colorless mana
• Infinite creature tokens
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite mana creatures you control can produce
• Infinite sacrifice triggers
• Infinite tap triggers
• Infinite untap of all creatures