Slimefoot and Squee, Phyrexian Altar, and Pawn of Ulamog

Prerequisites

• Slimefoot and Squee on the battlefield
• Phyrexian Altar on the battlefield
• Pawn of Ulamog 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, Pawn of Ulamog triggers twice, creating two 0/1 Eldrazi Spawn creature tokens
3. Activate Phyrexian Altar by sacrificing the two Eldrazi Spawns, 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