Druid's Call, Intruder Alarm, and Lightning Volley

Prerequisites

• Druid's Call on the battlefield
• Intruder Alarm on the battlefield
• Lightning Volley in hand
• Druid's Call attached to an indestructible creature you control that does not have summoning sickness
• available

Steps

1. Cast Lightning Volley by paying
2. Activate the creature with Druid's Call attached by tapping it, dealing 1 damage to itself
3. Druid's Call triggers, creating a 1/1 Squirrel creature token
4. The Squirrel enters the battlefield, triggering Intruder Alarm, untapping all creatures
5. Repeat from step 2

Results

• Infinite creature tokens
• Infinite ETB
• Infinite mana creatures you control can produce
• Infinite untap of creatures you control