How can you create a combo with Marrow-Gnawer, Ashnod's Altar, Sword of the Paruns?
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[START OF COMBO]This combo can be formed with Marrow-Gnawer, Ashnod's Altar, Sword of the Paruns

Color identity: B
Mana cost: 
Steps:
  1. Activate Marrow-Gnawer by tapping it and sacrificing another Rat, creating at least three 1/1 Rat creature tokens.
  2. Activate Ashnod's Altar twice by sacrificing two Rat tokens, adding {C}{C}{C}{C}.
  3. Activate Sword of Paruns by paying {3}, untapping Marrow-Gnawer.
  4. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite colorless mana
  - Infinite creature tokens
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite sacrifice triggers
  - Infinite untap of creatures you control
  - Infinite mana creatures you control can produce[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - Sword of Paruns attached to Marrow-Gnawer.
  - Marrow-Gnawer does not have summoning sickness.
  - You control at least three additional Rats.
[END OF COMBO PREREQUISITES]
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