Soul Foundry, Intruder Alarm, March of the Machines, and Ornithopter

Prerequisites

• Soul Foundry on the battlefield
• Intruder Alarm on the battlefield
• March of the Machines on the battlefield
• Ornithopter in exile

Steps

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

Results

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