How can you create a combo with Archelos, Lagoon Mystic, Gretchen Titchwillow, Biomancer's Familiar, Simic Growth Chamber?
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[START OF COMBO]This combo can be formed with Archelos, Lagoon Mystic, Gretchen Titchwillow, Biomancer's Familiar, Simic Growth Chamber

Color identity: BGU
Mana cost: 
Steps:
  1. Play Simic Growth Chamber.
  2. Simic Growth Chamber enters the battlefield untapped due to Archelos, triggering itself.
  3. Holding priority, activate Simic Growth Chamber by tapping it, adding {G}{U}.
  4. Resolve the Simic Growth Chamber trigger from step 2, returning itself to your hand from the battlefield.
  5. Activate Gretchen Titchwillow by paying {G}{U}, causing you to draw a card and put Simic Growth Chamber from your hand onto the battlefield.
  6. 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:
  - Archelos, Lagoon Mystic must be on the battlefield
  - Gretchen Titchwillow must be on the battlefield
  - Biomancer's Familiar must be on the battlefield
  - Simic Growth Chamber must be in your hand
  - Archelos is untapped.
[END OF COMBO PREREQUISITES]
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