Thopter Squadron, Krark-Clan Ironworks, and Worldwalker Helm

Prerequisites

• Thopter Squadron on the battlefield
• Krark-Clan Ironworks on the battlefield
• Worldwalker Helm on the battlefield
• available

Steps

1. Activate Thopter Squadron's first ability by paying and removing a +1/+1 counter from it, creating a Map and a 1/1 Thopter artifact creature tokens
2. Activate Krark-Clan Ironworks by sacrificing the Map, adding
3. Activate Thopter Squadron's second ability by paying and sacrificing the Thopter, putting a +1/+1 counter on it
4. Repeat

Results

• Infinite creature LTB
• Infinite creature ETB
• Infinite creature sacrifice triggers
• Infinite death triggers