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

Prerequisites

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

Steps

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

Results

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