How can you create a combo with Geralf's Messenger, Ashnod's Altar, Nim Deathmantle?
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[START OF COMBO]This combo can be formed with Geralf's Messenger, Ashnod's Altar, Nim Deathmantle

Color identity: B
Mana cost: 
Steps:
  1. Activate Ashnod's Altar by sacrificing Geralf's Messenger, adding {C}{C}.
  2. Nim Deathmantle and Geralf's Messenger's undying ability triggers.
  3. Resolve the Nim Deathmantle trigger, choosing not to pay for the trigger.
  4. Resolve the Geralf's Messenger trigger, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
  5. Geralf's Messenger enters the battlefield, causing target opponent to lose 2 life.
  6. Activate Ashnod's Altar by sacrificing Geralf's Messenger, adding {C}{C}.
  7. Nim Deathmantle triggers, causing you to pay {4} to return Geralf's Messenger from your graveyard to the battlefield, and attach Nim Deathmantle to it.
  8. Geralf's Messenger enters the battlefield, causing target opponent to lose 2 life.
  9. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite lifeloss
  - Infinite leaves the battlefield
  - Infinite sacrifice triggers[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
[END OF COMBO PREREQUISITES]
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