Pentavus, Earthcraft, and Intruder Alarm

Prerequisites

• Pentavus on the battlefield
• Earthcraft on the battlefield
• Intruder Alarm on the battlefield
• You control a basic land

Steps

1. Activate Earthcraft by tapping Pentavus, untapping a basic land you control
2. Activate a basic land you control by tapping it, adding
3. Activate Pentavus' first ability by paying and removing a +1/+1 counter from it, creating a 1/1 Pentavite creature token
4. The Pentavite enters the battlefield, triggering Intruder Alarm
5. Holding priority, activate Earthcraft by tapping the Pentavite, untapping a basic land you control
6. Activate a basic land you control by tapping it, adding
7. Resolve the Intruder Alarm trigger, untapping all creatures
8. Activate Earthcraft by tapping the Pentavite, untapping a basic land you control
9. Activate a basic land you control by tapping it, adding
10. Activate Pentavus' second ability by paying and sacrificing a Pentavite, putting a +1/+1 counter on Pentavus
11. Repeat

Results

• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite mana basic lands you control can produce
• Infinite mana creatures you control can produce
• Infinite sacrifice triggers
• Infinite untap of all creatures