How can you create a combo with Tawnos, Solemn Survivor, Intruder Alarm, Priest of Urabrask?
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[START OF COMBO]This combo can be formed with Tawnos, Solemn Survivor, Intruder Alarm, Priest of Urabrask

Color identity: WUBR
Mana cost: {1}{W}{U}{B}
Steps:
  1. Activate Tawnos' second ability by paying {1}{W}{U}{B}, sacrificing two artifact tokens, and exiling Priest of Urabrask from your graveyard, creating a token copy of Priest of Urabrask that is an artifact in addition to its other types.
  2. The Priest of Urabrask token enters the battlefield, triggering itself and Intruder Alarm.
  3. Resolve the Priest of Urabrask trigger, adding {R}{R}{R}.
  4. Resolve the Intruder Alarm trigger, untapping all creatures.
  5. Activate Tawnos' first ability by paying {2} and tapping it, creating a token copy of the Priest of Urabrask token, and causing you to mill two cards.
  6. Repeat from step 2.
  7. Once you have infinite red mana, you may instead choose any other artifact token(s) to make infinite copies of them.[END OF COMBO STEPS]

Result:
  - Infinite copies of artifact tokens you control
  - Infinite creature tokens
  - Infinite enters the battlefield
  - Infinite mana creatures you control can produce
  - Infinite red mana
  - Infinite self-mill
  - Infinite untap of all creatures[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Tawnos, Solemn Survivor must be on the battlefield
  - Intruder Alarm must be on the battlefield
  - Priest of Urabrask must be in the graveyard
  - Tawnos does not have summoning sickness.
  - You control at least two artifact tokens.
[END OF COMBO PREREQUISITES]
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