Teysa, Orzhov Scion, Darkest Hour, and Hammerhead, Maggia Boss

Prerequisites

• Teysa, Orzhov Scion on the battlefield
• Darkest Hour on the battlefield
• Hammerhead, Maggia Boss on the battlefield

Steps

1. Activate Hammerhead by sacrificing another creature
2. When the creature dies, Teysa triggers, creating a 1/1 Spirit creature token that is black due to Darkest Hour
3. Resolve the Hammerhead ability
4. Repeat

Results

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