Yenna, Redtooth Regent, Ashnod's Altar, Jump Scare, and Sky Hussar

Prerequisites

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

Steps

1. Cast Jump Scare by paying , targeting Sky Hussar
2. Activate Yenna by paying and tapping it, creating a token copy of Sky Hussar
3. When the Sky Hussar token enters, it triggers, untapping all creatures you control
4. Activate Ashnod's Altar by sacrificing the Sky Hussar 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