Pernicious Deed [Apocalypse] Mountain I don't think you build

I don't think you build one on purpose

Set: Kaladesh Inventions Type: Artifact Mythic Cost: {5} As Gauntlet of Power enters the battlefield

Creatures you control gain protection from the chosen color until end of turn

Set: Portal Three Kingdoms Type: Legendary Creature — Human Soldier Rare Cost: {3}{B}{B} Horsemanship (This creature can't be blocked except by creatures with horsemanship

Pernicious Deed [Apocalypse] Mountain I don't think you buildSet: Apocalypse Type: Enchantment Rare Cost: {1}{B}{G} {X}, Sacrifice Pernicious Deed: Destroy each artifact, creature, and enchantment with converted mana cost X or less. "Yawgmoth," Freyalise whispered as she set the bomb, "now you will pay for your treachery."