Been away for a while and had a few questions.

If I use an ATA like GOTG(guardians) do I know keep whatever other team ability I had or do I lose it?

If I have 2 team abilities(PC and doom ) do i get the benefits of both all the time or just one at a time?

anything else I should know about ATA's or changes since supernova?

You are only allowed one ATA per force. They are assigned to figures with certain keywords. You must pay the cost of the ATA for EVERY figure on your force with the pre-requisite keywords, and then they all may use it. If they have a normal team ability, they can use it alone with the ATA. Wildcards can copy ATAs your force is using as long as the ATA doesn't say uncopyable.

Also, since rowdy didn't touch on this, Doom can use both the Power Cosmic TA and whatever other TA is available for him to Wildcard to.

You keep your other Team Ability.
Both.
If you haven't been playing since Supernova, I would highly recommend reading through the 2011 Heroclix rulebook, which you can download for free here: http://heroclix.com/downloads/herocl...#axzz1rrvuWMYh