How can you create a combo with Gravelgill Axeshark, Luminous Broodmoth, Phyrexian Altar?
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[START OF COMBO]This combo can be formed with Gravelgill Axeshark, Luminous Broodmoth, Phyrexian Altar

Color identity: WUB
Mana cost: 
Steps:
  1. Sacrifice Gravelgill Axeshark to Phyrexian Altar to add one mana of any color.
  2. Return Gravelgill Axeshark to the battlefield with the persist trigger, giving it a -1/-1 counter.
  3. Sacrifice Gravelgill Axeshark to Phyrexian Altar to add one mana of any color.
  4. Return Gravelgill Axeshark to the battlefield with the Luminous Broodmoth trigger, giving it a flying counter.
  5. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite colored mana
  - Infinite death triggers
  - Infinite enters the battlefield
  - 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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