With the new "free" mill card, Chancellor of the Spires, along with Surgical Extraction UB Mill might be viable in Standard.
Best case scenario:
You have Chancellor of the Spires, Surgical Extraction and a random 1CMC card or maybe Mental Misstep/Spell Pierce in your opening hand. First, mill 7. Then either play the 1CMC to draw possible opponent's Mental Misstep and follow by Surgical Extraction or pay life to play SE right away with counter backing up.
Unless the opponent has Leyline of Sanctity out, this is 99% unstoppable. The rest is just regular milling and counterspelling.
Very fast milling with a threat removal seems nice.