How can you create a combo with Mirrodin Besieged, Morality Shift?
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[START OF COMBO]This combo can be formed with Mirrodin Besieged, Morality Shift

Color identity: UB
Mana cost: {5}{B}{B}
Steps:
  1. Cast Morality Shift by pying {5}{B}{B}, exchanging your graveyard and library.
  2. At the beginning of your end step, Mirrodin Besieged triggers, causing you to loot, and then causing target opponent to lose the game.[END OF COMBO STEPS]

Result:
  - Near-infinite self-mill
  - Target opponent loses the game[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Mirrodin Besieged must be on the battlefield
  - Morality Shift must be in your hand
  - "Phyrexian" chosen with Mirrodin Besieged.
  - There are at least fifteen artifact cards in library.
  - You have at least one card in your graveyard.
[END OF COMBO PREREQUISITES]
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