All 26 Combos with Urborg, Tomb of Yawgmoth

Kormus Bell + Urborg, Tomb of Yawgmoth + Elesh Norn, Grand Cenobite

Lock: Destroy all lands, Destroy all lands that enter the battlefield, Opponents can't have lands on the battlefield, Lock, Mass Land Denial

All lands are swamps with Urborg, Tomb of Yawgmoth. All swamps are 1/1 creatures with Kormus bell. All opponent creatures get -2/-2 from Elesh Norn, Grand Cenobite. Each opponent lands can not be played.

Cards: Kormus Bell, Urborg, Tomb of Yawgmoth, Elesh Norn, Grand Cenobite

Kormus Bell + Urborg, Tomb of Yawgmoth + Night of Souls' Betrayal

Lock: Destroy all lands, Destroy all lands that enter the battlefield, Lock, Mass Land Denial