Lethal Vapors, Mycosynth Lattice, and Stony Silence

Prerequisites

• Lethal Vapors on the battlefield
• Mycosynth Lattice on the battlefield
• Stony Silence on the battlefield

Steps

1. Whenever a creature enters the battlefield, Lethal Vapors triggers, destroying that creature
2. Because Stony Silence prevents Lethal Vapors's activated ability from being activated, it cannot be destroyed due to its ability

Results

• Destroy all creatures that enter the battlefield
• Lock on all activated abilities (including lands)