Venser, Corpse Puppet, Tainted Observer, and Krark-Clan Ironworks

Prerequisites

• Venser, Corpse Puppet on the battlefield
• Tainted Observer on the battlefield
• Krark-Clan Ironworks on the battlefield
• available

Steps

1. Cause a creature to enter the battlefield under your control
2. Tainted Observer triggers, causing you to pay to proliferate
3. Venser triggers, creating a legendary 3/3 The Hollow Sentinel artifact creature token
4. The Hollow Sentinel enters the battlefield, triggering Tainted Observer
5. Holding priority, activate Krark-Clan Ironworks by sacrifcing The Hollow Sentinel, adding
6. Resolve the Tainted Observer trigger, causing you to pay to proliferate
7. Repeat from step 3

Results

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