Mortimus, Tectonic Dragon

Defender, Reach
As an additional cost to cast Mortimus, Tectonic Dragon, sacrifice a basic Mountain land.
Lieutenant- As long as you control your commander, Mortimus, Tectonic Dragon gets +8/+2, loses Defender, and has "Whenever Mortimus, Tectonic Dragon deals damage to a player, destroy target land that player controls."
"I used to think mountains were big. Then that thing came from under one."