Slimefoot and Squee, Sek'Kuar, Deathkeeper, and Phyrexian Altar

Prerequisites

• Slimefoot and Squee on the battlefield
• Sek'Kuar, Deathkeeper on the battlefield
• Phyrexian Altar on the battlefield
• You control at least one Saproling
• You control at least one additional nontoken creature

Steps

1. Activate Phyrexian Altar twice by sacrificing another nontoken creature you control and Slimefoot and Squee, adding
2. When the creatures die, Sek'Kuar triggers twice, creating two 3/1 Graveborn creature tokens
3. Activate Phyrexian Altar by sacrificing the two Graveborns, adding
4. Activate Slimefoot and Squee by paying and sacrificing a Saproling, returning it and another creature from your graveyard to the battlefield
5. When Slimefoot and Squee enter the battlefield, it triggers, creating a 1/1 Saproling creature token
6. Repeat

Results

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