Szarel, Genesis Shepherd, Crystalline Crawler, Reassembling Skeleton, and Hammerhead, Maggia Boss

Prerequisites

• Szarel, Genesis Shepherd on the battlefield
• Crystalline Crawler on the battlefield
• Reassembling Skeleton in the graveyard
• Hammerhead, Maggia Boss on the battlefield

Steps

1. Activate Reassembling Skeleton by paying , returning it from your graveyard to the battlefield
2. Activate Hammerhead by sacrificing Reassembling Skeleton
3. When Reassembling Skeleton is sacrificed, Szarel triggers, putting a number of +1/+1 counters equal to Szarel's power on Crystalline Crawler
4. Resolve the Hammerhead ability
5. Activate Crystalline Crawler twice by removing two +1/+1 counters from it, adding
6. Repeat

Results

• Infinite +1/+1 counters on creatures you control
• Infinite colored mana
• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite death triggers