You get a 12/12 trampling monster, plus a powerful and flexible ability that triggers whenever you attack, so you dont have to wait until Ghalta and Mavren itself attacks to get the benefit
Its an excellent board wipe, and its lethality is hard to argue with
Again, it doesnt matter which side is the front or back-facing side when you play a MDFC
A regular Emrakul reprint will obviously help bring that down somewhat, but this movie poster version, which shows the creature going to town on some innocent architecture, is sure to retain value, making it one of the biggest chase cards in the set
The Landscape The biggest groups have 50,000-100,000+ members
A Trap Card must first be Set and can only be activated after the current turn has finished