March of the Machines + Mycosynth Lattice

U identity

Commander legal

The 2 combo pieces

• March of the Machines
• Mycosynth Lattice

How to execute it

1. Mycosynth Lattice causes all permanents to become artifacts, and March of the Machines causes all noncreature artifacts to become artifact creatures with power and toughness each equal to their mana value.
2. This causes all noncreature artifacts with mana value 0 or less, including lands, currently on the battlefield or that are put onto the battlefield to be put into their owner's graveyard as a state-based action due to having 0 toughness.

What the combo produces

• Destroy all lands
• Destroy all lands that enter the battlefield
• Destroy all noncreature permanents with mana value 0
• Destroy all noncreature permanents with mana value 0 upon entering
• Lock
• Mass Land Denial