Linvala, Keeper of Silence, Kormus Bell, and Blanket of Night

Prerequisites

• Linvala, Keeper of Silence on the battlefield
• Kormus Bell on the battlefield
• Blanket of Night on the battlefield

Steps

1. Blanket of Night 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