Yenna, Redtooth Regent, Agatha's Soul Cauldron, Ashnod's Altar, and Sparring Mummy

Prerequisites

• Yenna, Redtooth Regent on the battlefield
• Agatha's Soul Cauldron on the battlefield
• Ashnod's Altar on the battlefield
• Sparring Mummy on the battlefield
• plus enough mana to activate the Licid's ability available

Steps

1. Activate Sparring Mummy using the Licid's ability by paying its activation cost, attaching Sparring Mummy to Yenna and causing Sparring Mummy to become an Aura
2. Activate Yenna by paying and tapping it, creating a token copy of Sparring Mummy
3. When the Sparring Mummy token enters, it triggers, untapping Yenna
4. Activate Ashnod's Altar by sacrificing the Sparring Mummy token, adding
5. Repeat from step 2

Results

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