Cover of Darkness

Tribal evasion sold as a permanent: name a creature type as the enchantment enters, and everything sharing that type can no longer be chumped except by artifact or black creatures. Fear is the keyword doing the work, and it is the right one for a wide aggressive board: flying gets walled by any flier or reach creature, but fear only cares about a much narrower slice of blockers, so a swarm of Goblins or Zombies turns a grindy ground stall into a clock the defender mostly cannot answer in combat. The catch is total board dependence. With no creatures of the chosen type down, this is a blank, and an opponent who removes it hands every blocker back at once, which makes the question of when you commit it a real one rather than an automatic early-game drop. The harder constraint is the locked choice: the type is fixed as it enters, so a deck that pivots to a different threat base midgame is left with a buff aimed at creatures it no longer fields. That rigidity is the price for the cheap, static evasion, and it is why this only earns its slot in a deck already pointed hard at one tribe. Outside that narrow build, it does close to nothing.