I'm curious to what stops mass mutalisks in TVZ since irradiate is gone.

Do the Vikings fight well vs Mutalisks cost for cost?

The reason I say this is that Terran has nothing to stop the guardian threat that Zerg gets once it has air superiority. Basically in vanilla SC if Terran couldn't stop Zerg air, the guardians would pick apart the Terran army slowly but surely.

Maybe this is what the Thor is for? My only concern is that the Thor looks like it move slow. If it doesn't do a lot of damage to mutas, you won't be able to split your forces. And seeing as mutas are fast, the zerg can just map control and win that way.

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Q u o t e:
I'm curious to what stops mass mutalisks in TVZ since irradiate is gone.

Do the Vikings fight well vs Mutalisks cost for cost?

The reason I say this is that Terran has nothing to stop the guardian threat that Zerg gets once it has air superiority. Basically in vanilla SC if Terran couldn't stop Zerg air, the guardians would pick apart the Terran army slowly but surely.

Maybe this is what the Thor is for? My only concern is that the Thor looks like it move slow. If it doesn't do a lot of damage to mutas, you won't be able to split your forces. And seeing as mutas are fast, the zerg can just map control and win that way.

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Thors and Marines (with stimpack and the additional hp upgrade) are quite effective against mass Mutalisks. Additionally as mentioned already in this thread, BCs are also very effective, especially with its new missile barrage ability (but of course this is at a later tech).

There is one other counter, which is not mentioned in this thread, which is the Ghost! The Ghost is awesome at taking out Mutalisks as well, since they get a bonus to light armor, and have a very long range. Add that to snipe, cloak, or a bunker and it is quite a formidable counter as well.