How can you create a combo with Dual Casting, Toils of Night and Day, Twinning Staff?
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[START OF COMBO]This combo can be formed with Dual Casting, Toils of Night and Day, Twinning Staff

Color identity: UR
Mana cost: {2}{U}{R}
Steps:
  1. Cast Toils of Night and Day with any targets.
  2. Pay {R} and tap the creature enchanted with Dual Casting to copy Toils of Night and Day, targeting the creature enchanted with Dual Casting and a permanent that can tap for {R}.
  3. Twinning Staff triggers, creating a copy of Toils of Night and Day.
  4. The copy targets at least the permanent.
  5. Allow the first copy of Toils of Night and Day 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
  - Toils of Night and Day must be in your hand
  - Twinning Staff must be on the battlefield
  - Dual Casting attached to any creature you control without summoning sickness.
  - A permanent that can tap for {R}.
[END OF COMBO PREREQUISITES]
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