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

Color identity: UB
Mana cost: 
Steps:
  1. Activate Viscera Seer by sacrificing itself, causing you to scry 1.
  2. Activate Gravespawn Sovereign by tapping five untapped Zombies you control, returning Viscera Seer from your graveyard to the battlefield.
  3. Viscera Seer enters the battlefield, triggering Intruder Alarm, untapping all creatures.
  4. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite sacrifice triggers
  - Infinite scry 1
  - Infinite untap of creatures[END OF COMBO RESULT][END OF COMBO]

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