Othelm, Sigardian Outcast + Ashnod's Altar + Intruder Alarm

Prerequisites

• You control at least one other nontoken creature.
• Othelm does not have summoning sickness.

Steps

1. 1Activate Ashnod's Altar by sacrificing any other nontoken creature, adding .
2. 2Activate Othelm by paying and tapping it, returning a creature from your graveyard to the battlefield.
3. 3The creature enters the battlefield, triggering Intruder Alarm, untapping all creatures.
4. 4Repeat.

Effects

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