Kenrith, the Returned King, Phyrexian Altar, Training Grounds, and Zirda, the Dawnwaker

Prerequisites

• Kenrith, the Returned King on the battlefield
• Phyrexian Altar on the battlefield
• Training Grounds on the battlefield
• Zirda, the Dawnwaker on the battlefield
• You control at least one additional nontoken creature

Steps

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

Results

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