How can you create a combo with Reins of Power, Sigil Tracer?
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[START OF COMBO]This combo can be formed with Reins of Power, Sigil Tracer

Color identity: U
Mana cost: {2}{U}{U}
Steps:
  1. Cast Reins of Power by paying {2}{U}{U}.
  2. Holding priority, activate all mana-producing creatures you control by tapping them, adding at least {2}{U}{U}.
  3. Activate Sigil Tracer twice by paying {2}{U}{U}, tapping it and three other Wizards you control, copying Reins of Power twice.
  4. Resolve the first copy of Reins of Power, untapping all creatures you and target opponent control, and exchanging control of those creatures.
  5. Resolve the second copy of Reins of Power, untapping all creatures you and target opponent control, and exchanging control of those creatures, causing you to regain control of all the creatures you originally controlled.
  6. Repeat from step 2.
  7. If creatures you control can tap to produce at least {3}{U}{U}, this combo nets infinite mana.[END OF COMBO STEPS]

Result:
  - Infinite magecraft triggers
  - Infinite mana creatures you control can produce
  - Infinite mana creatures you control can produce for target opponent
  - Infinite untap of creatures you control[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Reins of Power must be in your hand
  - Sigil Tracer must be on the battlefield
  - You control at least three additional Wizards.
  - Creatures you control can tap to produce at least {2}{U}{U}.
[END OF COMBO PREREQUISITES]
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