Emmara, Soul of the Accord, Intruder Alarm, and Heavy Arbalest

Prerequisites

• Emmara, Soul of the Accord on the battlefield
• Intruder Alarm on the battlefield
• Heavy Arbalest on the battlefield
• Heavy Arbalest attached to Emmara
• Emmara does not have summoning sickness

Steps

1. Activate Emmara by tapping it, targeting any target
2. Emmara triggers, creating a 1/1 Human Warrior creature token
3. When the Human Warrior enters the battlefield, Intruder Alarm triggers, untapping all creatures
4. Resolve the Emmara ability from step 1, dealing 2 damage to any target
5. Repeat

Results

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