How can you create a combo with Beledros Witherbloom, Urza's Saga, Agatha's Soul Cauldron, Arwen, Weaver of Hope, Diamond Valley?
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[START OF COMBO]This combo can be formed with Beledros Witherbloom, Urza's Saga, Agatha's Soul Cauldron, Arwen, Weaver of Hope, Diamond Valley

Color identity: BG
Mana cost: 
Steps:
  1. Activate any number of lands except Urza's Saga by tapping them, adding at least {2}.
  2. Activate Urza's Saga's second ability by paying {2} and tapping it, creating a 0/0 Construct artifact creature token that gets +1/+1 for each artifact you control, and that enters the battlefield with a number of +1/+1 counters equal to Arwen's toughness.
  3. Activate the Construct using Beledros Witherbloom's ability by paying 10 life, untapping all lands you control.
  4. Activate Diamond Valley by tapping it and sacrificing the Construct, causing you to gain at least 10 life.
  5. Repeat.
  6. If the number of artifacts you control plus Arwen's toughness is equal to or greater than 10, this combo nets infinite life, and if other lands you control can tap to produce at least {3}, this combo nets infinite mana.
  7. If you get infinite life and infinite mana, you may forego sacrificing the Constructs.[END OF COMBO STEPS]

Result:
  - Infinite creature tokens
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite lifegain
  - Infinite lifegain triggers
  - Infinite leaves the battlefield
  - Infinitely large Construct tokens
  - Infinite mana lands you control can produce
  - Infinite sacrifice triggers
  - Infinite untap of lands you control[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Beledros Witherbloom must be exiled
  - Urza's Saga must be on the battlefield
  - Agatha's Soul Cauldron must be on the battlefield
  - Arwen, Weaver of Hope must be on the battlefield
  - Diamond Valley must be on the battlefield
  - Urza's Saga has two lore counters on it.
  - Lands you control except Urza's Saga can tap to produce at least {2}.
  - Your life total is at least 11.
  - The number of artifacts you control plus Arwen's toughness is equal to or greater than 9.
[END OF COMBO PREREQUISITES]
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