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

Color identity: UB
Mana cost: 
Steps:
  1. Activate Carrion Feeder by sacrificing a nontoken creature, putting a +1/+1 counter on it.
  2. Activate Gravespawn Sovereign by tapping five untapped Zombies you control, returning any creature from your graveyard to the battlefield.
  3. The creature enters the battlefield, triggering Intruder Alarm, untapping all creatures.
  4. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite +1/+1 counters on Carrion Feeder
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite sacrifice triggers
  - Infinite untap of creatures[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - You control at least three other Zombies and an additional nontoken creature.
[END OF COMBO PREREQUISITES]
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