How can you create a combo with Urborg, Tomb of Yawgmoth, Kormus Bell, Make Obsolete?
user
[START OF COMBO]This combo can be formed with Urborg, Tomb of Yawgmoth, Kormus Bell, Make Obsolete

Color identity: B
Mana cost: 
Steps:
  1. With Urborg on the battlefield, all lands are swamps.
  2. With Kormus Bell on the battlefield, all Swamps are 1/1 creatures.
  3. Cast Make Obsolete, giving all creatures your opponent control -1/-1 until end of turn, destroying all their lands.[END OF COMBO STEPS]

Result:
  - Destroy all lands opponents control
  - Destroy all x/1 creatures your opponents control[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Urborg, Tomb of Yawgmoth must be on the battlefield
  - Kormus Bell must be on the battlefield
  - Make Obsolete must be in your hand
  - {2}{B} to cast it.
[END OF COMBO PREREQUISITES]
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