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

Prerequisites

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

Steps

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

Results

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