And Reno vs Zeprhys... well, Reno is just too good. He and Rafaam are the best characters Hearthstone ever came up with (Dr. Boom being close but not good enough).
Dr. Boom is not actually a Hearthstone character. His personality was expanded upon and embelished, but he was part of a questline in the Burning Crusade expansion of WoW way back in the early 2000's already.
Fun fact: Ranged Damage classes used Dr. Boom to test their damage before World of Warcraft got Training dummies to do this on in a more practical manner. :)
I knew about the origins of Dr.Boom, I'm a WoW player myself... but let's face it, Dr.Boom as a character is entirely a work of Hearthstone.