Avacyn, Angel of Hope, Druid's Call, Intruder Alarm, and Master of the Wild Hunt

Prerequisites

• Avacyn, Angel of Hope on the battlefield
• Druid's Call on the battlefield
• Intruder Alarm on the battlefield
• Master of the Wild Hunt on the battlefield
• You control at least one untapped Wolf
• Master of the Wild Hunt does not have summoning sickness

Steps

1. Activate Master of the Wild by tapping it, tapping all untapped Wolves you control, then causing them to deal damage to the creature with Druid's Call attached equal to their power, then having the creature with Druid's Call attached deal damage to the Wolves equal to its power
2. Druid's Call triggers, creating a number of 1/1 Squirrel creature tokens equal to the damage dealt
3. When the Squirrel(s) enter the battlefield, Intruder Alarm triggers that many times, untapping all creatures
4. Repeat

Results

• Infinite creature tokens
• Infinite ETB
• Infinite untap of all creatures