Othelm, Sigardian Outcast, Hornet Queen, Intruder Alarm, and Ashnod's Altar

Prerequisites

• Othelm, Sigardian Outcast on the battlefield
• Hornet Queen 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 Hornet Queen, adding
2. Activate Othelm by paying and tapping it, returning Hornet Queen from your graveyard to the battlefield tapped
3. Hornet Queen enters the battlefield, triggering itself and Intruder Alarm
4. Resolve the Intruder Alarm trigger, untapping all creatures
5. Resolve the Hornet Queen trigger, creating four 1/1 Insect creature tokens
6. The Insect 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