Rograkh, Son of Rohgahh, Heidar, Rimewind Master, Intruder Alarm, Dual Nature, and Ashnod's Altar

Prerequisites

• Rograkh, Son of Rohgahh in hand
• Heidar, Rimewind Master on the battlefield
• Intruder Alarm on the battlefield
• Dual Nature on the battlefield
• Ashnod's Altar on the battlefield
• Heidar does not have summoning sickness
• You control at least four snow permanents

Steps

1. Cast Rograkh by paying
2. When Rograkh enters the battlefield, Intruder Alarm and Dual Nature's first ability triggers
3. Resolve the Intruder Alarm trigger, untapping all creatures
4. Resolve the Dual Nature trigger, creating a token copy of Rograkh
5. Activate Ashnod's Altar by sacrificing the Rograkh token, adding
6. Activate Heidar by paying and tapping it, returning Rograkh to your hand from the battlefield
7. Dual Nature's second ability triggers, exiling nothing
8. Repeat

Results

• Infinite ETB
• Infinite LTB
• Infinite mana creatures you control can produce
• Infinite storm count
• Infinite untap of all creatures