Linvala, Keeper of Silence, Kormus Bell, and Urborg, Tomb of Yawgmoth

Prerequisites

• Linvala, Keeper of Silence on the battlefield
• Kormus Bell on the battlefield
• Urborg, Tomb of Yawgmoth on the battlefield

Steps

1. Urborg turns all lands into Swamps
2. Kormus Bell turns all swamps into creatures
3. Linvala prevents your opponent' creatures from activating their abilities, including mana abilities

Results

• Opponents can't tap land for mana