Xyris, the Writhing Storm, Intruder Alarm, and Cephalid Looter

Prerequisites

• Xyris, the Writhing Storm on the battlefield
• Intruder Alarm on the battlefield
• Cephalid Looter on the battlefield
• Cephalid Looter does not have summoning sickness

Steps

1. Activate Cephalid Looter by tapping it, causing an opponent to loot
2. Xyris' first ability triggers, creating a 1/1 Snake creature token
3. The Snake enters the battlefield, triggering Intruder Alarm, untapping all creatures
4. Repeat

Results

• Infinite draw triggers for opponents
• Infinite looting for opponents
• Infinite self-discard triggers for opponents
• Near-infinite creature tokens
• Near-infinite ETB
• Near-infinite untap of all creatures