Karn, the Great Creator, and Mycosynth Lattice

Prerequisites

• Karn, the Great Creator on the battlefield
• Mycosynth Lattice on the battlefield

Steps

1. Mycosynth Lattice turns all permanents into artifacts
2. Activated abilities of permanents your opponent control can not be activated due to Karn, the Great Creator

Results

• Lock
• Mass Land Denial
• Activated abilities of permanents your opponents control can't be activated
• Activated abilities can't be activated