Othelm, Sigardian Outcast, Ashnod's Altar, and Thornbite Staff

Prerequisites

• Othelm, Sigardian Outcast on the battlefield
• Ashnod's Altar on the battlefield
• Thornbite Staff on the battlefield
• Thornbite Staff attached to Othelm
• Othelm does not have summoning sickness
• You control at least one additional nontoken creature

Steps

1. Activate Ashnod's Altar by sacrificing another nontoken creature, adding
2. The creature dies, triggering Othelm, untapping Othelm
3. Activate Othelm by paying and tapping it, returning the nontoken creature from your graveyard to the battlefield
4. Repeat

Results

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