How can you create a combo with Gravespawn Sovereign, Cursecatcher, Intruder Alarm?
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[START OF COMBO]This combo can be formed with Gravespawn Sovereign, Cursecatcher, Intruder Alarm

Color identity: UB
Mana cost: 
Steps:
  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.[END OF COMBO STEPS]

Result:
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Lock on opponent's instants and sorceries[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - At least four other Zombies on the battlefield.
[END OF COMBO PREREQUISITES]
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