How can you create a combo with Gretchen Titchwillow, Amulet of Vigor, Training Grounds, Simic Growth Chamber?
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[START OF COMBO]This combo can be formed with Gretchen Titchwillow, Amulet of Vigor, Training Grounds, Simic Growth Chamber

Color identity: GU
Mana cost: 
Steps:
  1. Play Simic Growth Chamber.
  2. Simic Growth Chamber enters the battlefield, triggering itself and Amulet of Vigor.
  3. Resolve the Amulet of Vigor trigger, untapping Simic Growth Chamber.
  4. Activate Simic Growth Chamber by tapping it, adding {G}{U}.
  5. Resolve the Simic Growth Chamber trigger from step 2, returning itself to your hand from the battlefield.
  6. Activate Gretchen Titchwillow by paying {G}{U}, causing you to draw a card and put Simic Growth Chamber from your hand onto the battlefield.
  7. Repeat from step 2.[END OF COMBO STEPS]

Result:
  - Infinite card draw
  - Infinite draw triggers
  - Near-infinite landfall triggers[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Gretchen Titchwillow must be on the battlefield
  - Amulet of Vigor must be on the battlefield
  - Training Grounds must be on the battlefield
  - Simic Growth Chamber must be in your hand
[END OF COMBO PREREQUISITES]
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