Yenna, Redtooth Regent, Ashnod's Altar, Jump Scare, and Corridor Monitor

Prerequisites

• Yenna, Redtooth Regent on the battlefield
• Ashnod's Altar on the battlefield
• Jump Scare in hand
• Corridor Monitor on the battlefield
• available

Steps

1. Cast Jump Scare by paying , targeting Corridor Monitor
2. Activate Yenna by paying and tapping it, creating a token copy of Corridor Monitor
3. When the Corridor Monitor token enters, it triggers, untapping Yenna
4. Activate Ashnod's Altar by sacrificing the Corridor Monitor token, adding
5. Repeat from step 2

Results

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