How can you create a combo with Dual Casting, Hidden Strings, Twinning Staff?
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[START OF COMBO]This combo can be formed with Dual Casting, Hidden Strings, Twinning Staff

Color identity: UR
Mana cost: {1}{U}{R}
Steps:
  1. Cast Hidden Strings with any targets.
  2. Pay {R} and tap the creature enchanted with Dual Casting to copy Hidden Strings, targeting the creature enchanted with Dual Casting and a permanent that can tap for {R}.
  3. Twinning Staff triggers, creating a copy of Hidden Strings.
  4. The copy targets at least the permanent.
  5. Allow the first copy of Hidden Strings to resolve.
  6. Tap the permanent for {R}.
  7. Repeat steps 2-6.[END OF COMBO STEPS]

Result:
  - Infinite colored mana
  - Infinite untap[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Dual Casting must be on the battlefield
  - Hidden Strings must be in your hand
  - Twinning Staff must be on the battlefield
  - Dual Casting attached to any creature you control without summoning sickness.
  - You control an additional permanent that can tap to produce {R}.
[END OF COMBO PREREQUISITES]
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