How can you create a combo with Ratadrabik of Urborg, Leyline of Singularity, Phyrexian Dreadnought?
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[START OF COMBO]This combo can be formed with Ratadrabik of Urborg, Leyline of Singularity, Phyrexian Dreadnought

Color identity: WUB
Mana cost: {1}
Steps:
  1. Cast Phyrexian Dreadnought by paying {1}.
  2. When Phyrexian Dreadnought enters the battlefield, it triggers, causing you to sacrifice it.
  3. When Phyrexian Dreadnought dies, Ratadrabik of Urborg triggers, creating a token copy of Phyrexian Dreadnought that is a 2/2 Zombie, and that is legendary due to Leyline of Singularity.
  4. Repeat from step 2.[END OF COMBO STEPS]

Result:
  - Draw the game
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Ratadrabik of Urborg must be on the battlefield
  - Leyline of Singularity must be on the battlefield
  - Phyrexian Dreadnought must be in your hand
[END OF COMBO PREREQUISITES]
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