How can you create a combo with Kederekt Leviathan, Necromancy?
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[START OF COMBO]This combo can be formed with Kederekt Leviathan, Necromancy

Color identity: UB
Mana cost: {2}{B}
Steps:
  1. Cast Necromancy by paying {2}{B}.
  2. Necromancy enters the battlefield, returning Kederekt Leviathan from your graveyard to the battlefield attached with Necromancy.
  3. Kederekt Leviathan triggers, returning all nonland permanents to their owner's hands.
  4. Necromancy triggers, causing you to sacrifice Kederekt Leviathan.
  5. Repeat each turn.[END OF COMBO STEPS]

Result:
  - Return all nonland permanents to owner's hand each turn[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Kederekt Leviathan must be in the graveyard
  - Necromancy must be in your hand
[END OF COMBO PREREQUISITES]
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