At 540 I have 48 cards that contain the phrase "Search your library". With 4 of them being planeswalker ultimates, the density seems borderline at best. I do think this card is strong: the effect is amazing and Lutri has been showing me that a 3/2 flash is a decent floor on its own. I do like the idea of Grixis thieves as a theme, and this fits nicely into that. Definitely warrants a test at least.
My High Octane Unpowered Cube on CubeCobra