How can you create a combo with Tawnos, Urza's Apprentice, Sands of Time?
user
[START OF COMBO]This combo can be formed with Tawnos, Urza's Apprentice, Sands of Time

Color identity: UR
Mana cost: 
Steps:
  1. At the beginning of the upkeep step, Sands of Time triggers.
  2. In response, tap all of your mana producing permanents.
  3. Activate Tawnos, copying the Sands of Time trigger.
  4. Let the copy resolve, untapping all your creatures, lands, and artifacts.
  5. Repeat from step 2.[END OF COMBO STEPS]

Result:
  - Infinite Mana during the upkeep step
  - Infinite taps
  - Infinite untap[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - All other permanents must be able to produce at least {1}{U}{R}.
  - Tawnos does not have summoning sickness.
[END OF COMBO PREREQUISITES]
assistant