Kenrith, the Returned King, Phyrexian Altar, Biomancer's Familiar, and Zirda, the Dawnwaker

Prerequisites

• Kenrith, the Returned King on the battlefield
• Phyrexian Altar on the battlefield
• Biomancer's Familiar on the battlefield
• Zirda, the Dawnwaker on the battlefield

Steps

1. Activate Phyrexian Altar by sacrificing another nontoken creature, adding
2. Activate Kenrith's fifth ability by paying due to Zirda and Biomancer's Familiar, putting the creature card onto the battlefield from your graveyard
3. Repeat

Results

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