Fain, the Broker, Thornbite Staff, Crystalline Crawler, and Tenacious Dead

Prerequisites

• Fain, the Broker on the battlefield
• Thornbite Staff on the battlefield
• Crystalline Crawler on the battlefield
• Tenacious Dead on the battlefield
• Thornbite Staff attached to Fain
• Fain does not have summoning sickness
• available

Steps

1. Activate Fain's first ability by tapping it and sacrificing Tenacious Dead
2. Tenacious Dead dies, triggering itself and Fain
3. Resolve the Fain trigger, untapping it
4. Resolve the Tenacious Dead trigger, causing you to pay to return it from your graveyard to the battlefield tapped
5. Resolve the Fain ability from step 1, putting two +1/+1 counters on Crystalline Crawler
6. Activate Crystalline Crawler's first ability twice by removing two counters from it, adding
7. Repeat

Results

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