Enchanted Evening, and Opalescence

Prerequisites

• Enchanted Evening on the battlefield
• Opalescence on the battlefield

Steps

1. All permanents become enchantment creatures with power and toughness equal to their mana value
2. All permanents with a mana value of zero will be destroyed due to having zero toughness

Results

• Mass Land Denial
• Destroy all permanents with mana value 0
• Destroy all permanents with mana value 0 upon entering