These days, whenever new cards become available, BR or Rakdos is where my mind goes first, pretty much everytime. Its not generally the best color combination, but admittedly The Joker’s philosophy does have a certain appeal to me in fiction, which this combination embodies in its recklessness.
My favorite card from Battle for Zendikar block was easily Inverter of Truth, no question about it. Its just so weird and hard to use. So, now that the structure of Standard has shifted and Eldrazi Displacer isn’t as easy to use to kill you, maybe a deck built around it could work.