Earthcraft, Intruder Alarm, and Deeproot Pilgrimage

Prerequisites

• Earthcraft in hand
• Intruder Alarm on the battlefield
• Deeproot Pilgrimage on the battlefield
• There is at least one basic land on the battlefield

Steps

1. Activate Earthcraft by tapping a nontoken Merfolk you control, targeting any basic land
2. Deeproot Pilgrimage triggers, creating a 1/1 Merfolk creature token
3. When the Merfolk enters the battlefield, Intruder Alarm triggers, untapping all creatures
4. Resolve the Earthcraft ability, untapping the basic land
5. If you controlled the basic land, you may activate it by tapping it, adding
6. Repeat

Results

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