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

Prerequisites

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

Steps

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

Results

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