Intruder Alarm, and Ghoulcaller Gisa

Prerequisites

• Intruder Alarm on the battlefield
• Ghoulcaller Gisa on the battlefield
• Gisa does not have summoning sickness
• You control a creature that can tap to produce at least
• You control at least one additional creature

Steps

1. Activate a creature you control by tapping it, adding
2. Activate Ghoulcaller Giser by paying , sacrificing a creature and tapping it, creating at least one 2/2 Zombie creature token
3. The Zombie token(s) enter the battlefield, triggering Intruder Alarm that many times, untapping all creatures
4. Repeat

Results

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