Myrkul definitely requires some effort building around it, but it can be quite strong if you do
Use the cantrips to set up your early turns (and occasionally plan out a timely Miracle Temporal Mastery), Spreading Seas to slow them down, hopefully flash in Dictate of Kruphix on their end step, untap and hold up Cryptic Command or Gigadrowse, and then cast Time Warp on Turn 5 and never pass the turn back to them
Baron Bertram Graywater If Baron Bertram Graywater always made an additional token la Chatterfang, Squirrel General, it would be a terrifying token commander
A Word of Caution None of the techniques described below are 100% conclusive
Bulk-friendly : Its one of the most common routes for printing hundreds of cards efficiently
This deck would need a lot of further tweaking to really take advantage of one