Mutavault, Deeproot Pilgrimage, and Intruder Alarm

Prerequisites

• Mutavault on the battlefield
• Deeproot Pilgrimage on the battlefield
• Intruder Alarm on the battlefield
• available

Steps

1. Activate Mutavault's second ability by paying , causing it to become a 2/2 creature with all creature types until end of turn
2. Activate Mutavault's first ability by tapping it, adding
3. Deeproot Pilgrimage triggers, creating a 1/1 Merfolk creature token
4. When the Merfolk enters the battlefield, Intruder Alarm triggers, untapping all creatures
5. Repeat from step 2

Results

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