Cloakwood Swarmkeeper, Animation Module, and Krark-Clan Ironworks

Prerequisites

• Cloakwood Swarmkeeper on the battlefield
• Animation Module on the battlefield
• Krark-Clan Ironworks on the battlefield
• You have a way to cause a token to enter the battlefield under your control

Steps

1. Cause a token to enter the battlefield under your control
2. The token enters the battlefield, triggering Cloakwood Swarmkeeper, putting a +1/+1 counter on Cloakwood Swarmkeeper
3. Animation Module triggers
4. Holding priority, activate Krark-Clan Ironworks by sacrificing the token, adding
5. Resolve the Animation Module trigger, causing you to pay to create a 1/1 Servo artifact creature token
6. Repeat from step 2

Results

• Infinite +1/+1 counters on Cloakwood Swarmkeeper
• Infinite colorless mana
• Infinite creature tokens
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers