Veteran of the Depths, Animation Module, Intruder Alarm, and Multani's Harmony

Prerequisites

• Veteran of the Depths on the battlefield
• Animation Module on the battlefield
• Intruder Alarm on the battlefield
• Multani's Harmony on the battlefield
• Veteran of the Depths does not have summoning sickness
• Multani's Harmony attached to Veteran of the Depths

Steps

1. Activate Veteran of the Depths by tapping it, adding one mana of any color
2. Veteran of the Depths triggers, putting a +1/+1 counter on itself
3. Animation Module triggers, causing you to pay to create a 1/1 Servo artifact creature token
4. Intruder Alarm triggers, untapping all creatures
5. Repeat

Results

• Infinite creature tokens
• Infinite ETB
• Infinitely large Veteran of the Depths