Yenna, Redtooth Regent, Agatha's Soul Cauldron, Ashnod's Altar, and Village Bell-Ringer

Prerequisites

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

Steps

1. Activate Village Bell-Ringer using the Licid's ability by paying its activation cost, attaching Village Bell-Ringer to Yenna and causing Village Bell-Ringer to become an Aura
2. Activate Yenna by paying and tapping it, creating a token copy of Village Bell-Ringer
3. When the Village Bell-Ringer token enters, it triggers, untapping all creatures you control Activate Ashnod's Altar by sacrificing the Village Bell-Ringer token, adding
4. 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