How can you create a combo with Aragorn, the Uniter, Shrieking Drake, Phyrexian Altar, Painter's Servant?
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[START OF COMBO]This combo can be formed with Aragorn, the Uniter, Shrieking Drake, Phyrexian Altar, Painter's Servant

Color identity: RGWU
Mana cost: {U}
Steps:
  1. Cast Shrieking Drake by paying {U}.
  2. Aragorn's first and second abilities trigger, causing you to scry 2 and create a 1/1 Human Soldier creature token.
  3. When Shrieking Drake enters the battlefield, it triggers, returning itself from the battlefield to your hand.
  4. Activate Phyrexian Altar by sacrificing the Human Soldier, adding {U}.
  5. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite sacrifice triggers
  - Infinite storm count[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Aragorn, the Uniter must be on the battlefield
  - Shrieking Drake must be in your hand
  - Phyrexian Altar must be on the battlefield
  - Painter's Servant must be on the battlefield
  - "White" chosen with Painter's Servant.
[END OF COMBO PREREQUISITES]
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