How can you create a combo with Wispweaver Angel, Mercurial Pretender?
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[START OF COMBO]This combo can be formed with Wispweaver Angel, Mercurial Pretender

Color identity: WU
Mana cost: {4}{U}
Steps:
  1. Cast Mercurial Pretender by paying {4}{U}, choosing to have it enter the battlefield as a copy of Wispweaver Angel.
  2. When Mercurial Pretender enters the battlefield, it triggers, blinking Wispweaver Angel.
  3. When Wispweaver Angel enters the battlefield, it triggers, blinking Mercurial Pretender, with Mercurial Pretender entering the battlefield as a copy of Wispweaver Angel.
  4. Repeat from step 2.[END OF COMBO STEPS]

Result:
  - Infinite enters the battlefield
  - Infinite leaves the battlefield[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Wispweaver Angel must be on the battlefield
  - Mercurial Pretender must be in your hand
[END OF COMBO PREREQUISITES]
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