Intruder Alarm, Warchanter Skald, and Opposition

Prerequisites

• Intruder Alarm on the battlefield
• Warchanter Skald on the battlefield
• Opposition on the battlefield
• Warchanter Skald has at least one Equipment and/or Aura attached

Steps

1. Activate Opposition by tapping Warchanter Skald, targeting Warchanter Skald
2. Warchanter Skald triggers, creating a 2/1 Dwarf Berserker creature token
3. The Dwarf Berserker enters the battlefield, triggering Intruder Alarm, untapping all creatures
4. Resolve the Opposition ability, tapping Warchanter Skald
5. Warchanter Skald triggers, creating a 2/1 Dwarf Berserker creature token
6. The Dwarf Berserker enters the battlefield, triggering Intruder Alarm, untapping all creatures
7. Repeat

Results

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