Cursecatcher + Gravespawn Sovereign + Intruder Alarm

UB identity

Commander legal

The 3 combo pieces

• Cursecatcher
• Gravespawn Sovereign
• Intruder Alarm

What must be in place

At least four other Zombies on the battlefield.

How to execute it

1. Whenever an opponent casts an instant or Sorcery, sacrifice Cursecatcher to counter that spell unless that opponent pays {1}.
2. Tap 5 untapped zombies you control to return Cursecatcher to the battlefield.
3. Intruder Alarm triggers, untapping all creatures.
4. Repeat.

What the combo produces

• Infinite creature LTB
• Infinite death triggers
• Infinite ETB
• Lock
• Opponents can't cast instants or sorceries