How can you create a combo with Gravecrawler, Merrow Bonegnawer, Paradise Mantle, Altar of Dementia?
user
[START OF COMBO]This combo can be formed with Gravecrawler, Merrow Bonegnawer, Paradise Mantle, Altar of Dementia

Color identity: B
Mana cost: 
Steps:
  1. Activate Merrow Bonegnawer by tapping it, adding {B}.
  2. Activate Altar of Dementia by sacrificing Gravecrawler, causing target player to mill cards equal to Gravecrawler's power.
  3. Cast Gravecrawler by paying {B}.
  4. Merrow Bonegnawer triggers, untapping itself.
  5. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite mill
  - Infinite sacrifice triggers
  - Infinite self-mill
  - Infinite storm count[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - Paradise Mantle attached to Merrow Bonegnawer.
  - Merrow Bonegnawer does not have summoning sickness.
  - You control at least one additional Zombie.
[END OF COMBO PREREQUISITES]
assistant