Ba Sing Se, Ashnod's Altar, Lotus Cobra, and Horizon Explorer

Prerequisites

• Ba Sing Se on the battlefield
• Ashnod's Altar on the battlefield
• Lotus Cobra on the battlefield
• Horizon Explorer on the battlefield
• available

Steps

1. Activate Ba Sing Se's second ability by paying and tapping it, earthbending itself
2. Activate Ashnod's Altar by sacrificing Ba Sing Se, adding
3. When Ba Sing Se dies, it triggers, returning itself from your graveyard to the battlefield untapped due to Horizon Explorer
4. When Ba Sing Se enters, Lotus Cobra triggers, adding
5. Repeat

Results

• Infinite LTB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite landfall triggers