How can you create a combo with Ratadrabik of Urborg, Atsushi, the Blazing Sky, Blade of Shared Souls?
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[START OF COMBO]This combo can be formed with Ratadrabik of Urborg, Atsushi, the Blazing Sky, Blade of Shared Souls

Color identity: WUBR
Mana cost: {2}{U}
Steps:
  1. Cast Blade of Shared Souls by paying {2}{U}.
  2. When Blade of Shared Souls enters the battlefield, it triggers, creating a 2/2 Rebel creature token, then attaching Blade of Shared Souls to it, and causing the Rebel creature token to become a copy of Atsushi.
  3. Put the token Atsushi into your graveyard due to the legend rule.
  4. When the token dies, it and Ratadrabik trigger.
  5. Resolve the token trigger, creating three Treasure tokens.
  6. Resolve the Ratadrabik trigger, creating a nonlegendary token copy of Atsushi that is a 2/2 Zombie.
  7. Activate two Treasures by tapping and sacrificing them, adding {2}.
  8. Activate Blade of Shared Souls' equip ability by paying {2}, attaching it to the Atsushi token and causing it to become a copy of Atsushi.
  9. Repeat from step 3.[END OF COMBO STEPS]

Result:
  - Exile your library
  - Infinite colored mana
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite Treasure tokens
  - Play all nonland cards in your library[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Ratadrabik of Urborg must be on the battlefield
  - Atsushi, the Blazing Sky must be on the battlefield
  - Blade of Shared Souls must be in your hand
[END OF COMBO PREREQUISITES]
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