Teysa, Orzhov Scion, Darkest Hour, and Carrion Feeder

Prerequisites

• Teysa, Orzhov Scion on the battlefield
• Darkest Hour on the battlefield
• Carrion Feeder on the battlefield
• An additional creature under your control

Steps

1. Sacrifice the additional creature to Carrion Feeder, putting a +1/+1 counter on it
2. Because of Darkest Hour, the creature is black, and thus triggers Teysa's ability, creating a 1/1 black Spirit token
3. Sacrifice the token to Carrion Feeder, putting a +1/+1 counter on it
4. Teysa's ability triggers again, creating another token

Results

• Infinite +1/+1 counters on Carrion Feeder
• Infinite death triggers
• Infinite sacrifice triggers