The Ooze, Umbral Collar Zealot, Renata, Called to the Hunt, and March of the Machines

Prerequisites

• The Ooze on the battlefield
• Umbral Collar Zealot on the battlefield
• Renata, Called to the Hunt on the battlefield
• March of the Machines on the battlefield

Steps

1. Activate Umbral Collar Zealot by sacrificing a creature with a +1/+1 counter on it
2. When that creature dies, The Ooze triggers, creating a Mutagen artifact token for each +1/+1 counter on the sacrificed creature
3. These artifacts are also 0/0 creatures due to March of the Machines
4. Each Mutagen artifact creature token enters with at least one +1/+1 counter on it due to Renata
5. Resolve the Umbral Collar Zealot ability, surveiling 1
6. Repeat from step 1

Results

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