Emmara, Soul of the Accord, Intruder Alarm, and Sunstrike Legionnaire

Prerequisites

• Emmara, Soul of the Accord on the battlefield
• Intruder Alarm on the battlefield
• Sunstrike Legionnaire on the battlefield
• Sunstrike Legionnaire and Emmara do not have summoning sickness

Steps

1. Activate Sunstrike Legionnaire by tapping it, tapping Emmara
2. Emmara triggers, creating a 1/1 Human Warrior creature token
3. The Human Warrior enters the battlefield, triggering Intruder Alarm, untapping all creatures
4. Repeat

Results

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