Ba Sing Se, Phyrexian Altar, Stone-Seeder Hierophant, and Zirda, the Dawnwaker

Prerequisites

• Ba Sing Se on the battlefield
• Phyrexian Altar on the battlefield
• Stone-Seeder Hierophant on the battlefield
• Zirda, the Dawnwaker on the battlefield
• available

Steps

1. Activate Ba Sing Se's second ability by paying due to Zirda and tapping it, earthbending another land you control
2. Activate Phyrexian Altar by sacrificing the other earthbent land, adding
3. When the land dies, Ba Sing Se triggers, returning the land from your graveyard to the battlefield tapped
4. When the land enters, Stone-Seeder Hierophant triggers, untapping Stone-Seeder Hierophant
5. Activate Stone-Seeder Hierophant by tapping it, untapping Ba Sing Se
6. Repeat

Results

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