Yenna, Redtooth Regent, Ashnod's Altar, Jump Scare, and Village Bell-Ringer

Prerequisites

• Yenna, Redtooth Regent on the battlefield
• Ashnod's Altar on the battlefield
• Jump Scare in hand
• Village Bell-Ringer on the battlefield
• available

Steps

1. Cast Jump Scare by paying , targeting Village Bell-Ringer
2. Activate Yenna by paying and tapping it, creating a token copy of Village Bell-Ringer
3. When the Village Bell-Ringer token enters, it triggers, untapping all creatures you control
4. Activate Ashnod's Altar by sacrificing the Village Bell-Ringer token, adding
5. Repeat from step 2

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite untap of creatures you control
• Infinite mana creatures you control can produce