Soul Foundry, Intruder Alarm, March of the Machines, and Shield Sphere

Prerequisites

• Soul Foundry on the battlefield
• Intruder Alarm on the battlefield
• March of the Machines on the battlefield
• Shield Sphere in exile
• Soul Foundry does not have summoning sickness
• Shield Sphere exiled by Soul Foundry

Steps

1. Activate Soul Foundry by paying and tapping it, creating a token copy of Shield Sphere When the Shield Sphere token enters the battlefield, Intruder Alarm triggers, untapping all creatures
2. Repeat

Results

• Infinite ETB
• Infinite creature tokens
• Infinite untap of all creatures
• Infinite mana creatures you control can produce
• Infinite mana artifacts you control can produce
• Infinite untap of all artifacts