Othelm, Sigardian Outcast, Ashnod's Altar, and Corridor Monitor

Prerequisites

• Othelm, Sigardian Outcast on the battlefield
• Ashnod's Altar on the battlefield
• Corridor Monitor on the battlefield
• Othelm does not have summoning sickness

Steps

1. Activate Ashnod's Altar by sacrificing Corridor Monitor, adding
2. Activate Othelm by paying and tapping it, returning Corridor Monitor from your graveyard to the battlefield
3. Corridor Monitor enters the battlefield, untapping Othelm
4. Repeat

Results

• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers
• Infinite tap triggers