How can you create a combo with Orvar, the All-Form, Great Whale, Change of Heart?
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[START OF COMBO]This combo can be formed with Orvar, the All-Form, Great Whale, Change of Heart

Color identity: WU
Mana cost: 
Steps:
  1. Activate up to seven lands you control by tapping them, adding at least {3}{W}.
  2. Cast Change of Heart with buyback by paying {3}{W}, targeting Great Whale.
  3. Orvar's first ability triggers, creating a token copy of Great Whale.
  4. The Great Whale token enters the battlefield, untapping up to seven lands.
  5. Resolve Change of Heart, returning it to your hand.
  6. Repeat.
  7. If you control up to seven lands that can tap to produce at least {4}{W}, this combo nets infinite mana, which you can then target any creatures you control in step 2 to create infinite token copies of them.[END OF COMBO STEPS]

Result:
  - Infinite copies of creatures you control
  - Infinite creature tokens
  - Infinite enters the battlefield
  - Infinite magecraft triggers
  - Infinite mana lands you control can produce
  - Infinite storm count
  - Infinite untap of lands you control[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Orvar, the All-Form must be on the battlefield
  - Great Whale must be on the battlefield
  - Change of Heart must be in your hand
  - You control up to seven lands that can tap to produce at least {3}{W}.
[END OF COMBO PREREQUISITES]
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