How can you create a combo with Volo, Guide to Monsters, Mercurial Pretender, Great Whale?
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[START OF COMBO]This combo can be formed with Volo, Guide to Monsters, Mercurial Pretender, Great Whale

Color identity: GU
Mana cost: 
Steps:
  1. Activate up to seven lands by tapping them, adding at least {3}{U}{U}.
  2. Cast Mercurial Pretender by paying {4}{U}.
  3. Volo triggers, creating a token copy of Mercurial Pretender.
  4. The token Mercurial Pretender enters the battlefield as a copy of Great Whale, untapping up to seven lands.
  5. Activate up to seven lands by tapping them, adding at least {3}{U}{U}.
  6. The nontoken Mercurial Pretender enters the battlefield as a copy of Great Whale, untapping up to seven lands.
  7. Activate the nontoken Mercurial Pretender by paying {2}{U}{U}, returning it from the battlefield to your hand.
  8. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite creature tokens
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite mana lands you control can produce
  - Infinite storm count[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Volo, Guide to Monsters must be on the battlefield
  - Mercurial Pretender must be in your hand
  - Great Whale must be on the battlefield
  - You control up to seven lands that can tap to produce at least {3}{U}{U}.
  - You have no other Shapeshifters on the battlefield or in your graveyard.
[END OF COMBO PREREQUISITES]
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