Szarel, Genesis Shepherd, Crystalline Crawler, Slimefoot and Squee, and Blasting Station

Prerequisites

• Szarel, Genesis Shepherd on the battlefield
• Crystalline Crawler on the battlefield
• Slimefoot and Squee in the graveyard
• Blasting Station on the battlefield
• available

Steps

1. Activate Slimefoot and Squee by paying and sacrificing a Saproling, returning it and up to one other creature card from your graveyard to the battlefield
2. When Slimefoot and Squee and up to one other creature enter the battlefield, Slimefoot and Squee triggers once, and Blasting Station triggers for each creature that entered
3. Resolve the Blasting Station abilities, untapping it
4. Resolve the Slimefoot and Squee ability, creating a 1/1 Saproling creature token
5. When the Saproling enters the battlefield, Blasting Station triggers
6. Holding priority, if you returned another creature in step 1, activate Blasting Station by tapping it and sacrificing that creature
7. If you did not, skip to step 9
8. When that creature dies, Szarel triggers, putting a number of +1/+1 counters equal to Szarel's power on Crystalline Crawler
9. Resolve the Blasting Station ability from step 6
10. Resolve the Blasting Station trigger from step 5, untapping it
11. Activate Blasting Station by tapping it and sacrificing Slimefoot and Squee
12. When Slimefoot and Squee is sacrificed, Szarel triggers, putting a number of +1/+1 counters equal to Szarel's power on Crystalline Crawler
13. Resolve the Blasting Station ability from step 10
14. Activate Crystalline Crawler four times by removing four +1/+1 counters from it, adding
15. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite colored mana
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite damage
• Infinite +1/+1 counters
• Infinite recursion of creature cards in your graveyard