In the Guilds of Ravnica set Dimir color pair, which is blue-black, creates many opportunities for players with the help of the Surveil mechanic, which works similar to Scry, but instead of putting cards on the bottom of your library, you put them into your graveyard.
Darkblade Agent benefits greatly from this mechanic and acquires deathtouch and card draw abilities every time you Surveil, and not just once when it enters the battlefield. This makes it one of the most valuable build-around cards in the Dimir color pair.
