Malygos versus Pyroblast in Freeze Mage

Hi Competitive Hearthstone,

I've been focusing on Freeze Mage for the past month or so now, and I still struggle to understand the choice between running either Malygos or Pyroblast. I've heard both cards described as good in the Control Warrior matchup, but I don't see how Malygos works there. It's hard to expect either Emperor or Malygos himself to last on the board longer than one turn when you present so few real removal targets. So the most common situation I can imagine is something like Malygos + Frostbolt + Icelance for 17 at the expense of making your Antonidas combo worse.

For non-control matchups, I imagine that Malygos is a fine body that will stick around to provide both burn and help cleaning up their smaller minions. I just worry that he is too reliant on getting the right Emperor activation and is a win condition that is weak to spot removal when the deck without him is very strong against removal.

I've found Pyroblast to be good in matchups where you want to spend some of your burn as removal, or for when you are just unable to draw into Antonidas and/or Alexstrasza for lethal. It is a boring card to just sit on, but I think it's best for when you aren't able to depend on the tempo swing of an aggressive Alex into lethal--where you'll be burning them down naturally and not have the time to draw into combo.

Do any of you have thoughts on the cards or a source to share?