How can you create a combo with Shaun, Father of Synths, Breath of Fury?
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[START OF COMBO]This combo can be formed with Shaun, Father of Synths, Breath of Fury

Color identity: UR
Mana cost: 
Steps:
  1. Declare the legendary creature with haste and the creature with Breath of Fury attached as attackers.
  2. Shaun's first ability triggers, creating a tapped and attacking token of the legendary creature with haste that isn't legendary.
  3. Deal combat damage using the creature that has Breath of Fury attached. 
  4. Breath of Fury triggers, causing you to sacrifice the creature it is attached to, then attach Breath of Fury to the token copy of the legendary creature with haste, then causing you to untap all creatures you control and to get an additional combat phase after this one.
  5. Repeat each combat phase.[END OF COMBO STEPS]

Result:
  - Infinite leaves the battlefield
  - Infinite enters the battlefield
  - Infinite sacrifice triggers
  - Infinite death triggers
  - Infinite combat phases
  - Infinite untap of creatures you control
  - Infinite mana creatures you control can produce
  - Infinite combat damage[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - An opponent cannot block creatures you control.
  - Breath of Fury attached to any other creature you control that does not have summoning sickness.
[END OF COMBO PREREQUISITES]
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