Yes you obviously need Emperor, same thing for the Leeryo combo except you only need to hit one combo card for it to work. That’s usually how combo decks works.

You do know that this deck is already posted on the site right? http://www.hearthstonetopdecks.com/decks/muzzys-zhandaly-legend-dude-paladin-february-2018/

You could replace Ragnaros with Dr. Boom. But to be honest he was only played back then because the power level of was way lower than today.

No because you really don’t want to kill your minions. Mech decks are fun!

Why no firelands portal? You get it for free.

Because that would dilute the cards that Spiteful Summoner reveals.