Death's Presence, Krark-Clan Ironworks, and Thopter Squadron

Prerequisites

• Death's Presence on the battlefield
• Krark-Clan Ironworks on the battlefield
• Thopter Squadron on the battlefield
• Thopter Squadron has at least two +1/+1 counters on it
• available

Steps

1. Activate Thopter Squadron's first ability by paying and removing a +1/+1 counter from it, creating a 1/1 Thopter artifact creature token
2. Activate Krark-Clan ironworks by sacrificing the Thopter, adding
3. When the Thopter dies, Death's Presence triggers, putting a +1/+1 counter on Thopter Squadron
4. Repeat

Results

• Infinite colorless mana
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers