Othelm, Sigardian Outcast, Ashnod's Altar, and Sky Hussar

Prerequisites

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

Steps

1. Activate Ashnod's Altar by sacrificing Sky Hussar, adding
2. Activate Othelm by paying and tapping it, returning Sky Hussar from your graveyard to the battlefield
3. Sky Hussar enters the battlefield, untapping all creatures you control
4. Repeat

Results

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