Fain, the Broker, Thornbite Staff, Crystalline Crawler, and Reassembling Skeleton

Prerequisites

• Fain, the Broker on the battlefield
• Thornbite Staff on the battlefield
• Crystalline Crawler on the battlefield
• Reassembling Skeleton on the battlefield
• Thornbite Staff attached to Fain
• Fain does not have summoning sickness

Steps

1. Activate Fain's first ability by tapping it and sacrificing Reassembling Skeleton
2. Reassembling Skeleton dies, triggering Fain, untapping Fain
3. Resolve the Fain ability from step 1, putting two +1/+1 counters on Crystalline Crawler
4. Activate Crystalline Crawler's first ability twice by removing two counters from it, adding
5. Activate Reassembling Skeleton by paying , returning it from your graveyard to the battlefield tapped
6. Repeat

Results

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