For instance can the Old Thunderbolts card still give Avengers any team ability in place of the Avengers ability in Golden age rules?

Thanks.

No. The old versions of the ATAs are banned from tournament play.

<Nelson Muntz>

Ha ha!

And for anyone looking for rules support on that....

From the Player's Guide:

But what about the new ones that just came out or were updated? Those are leagal in Modern right? Even though feats aren't aloud in modern, the current ATA's can be used. Right?

ATA's *are not* feats.

Rule of thumb:
those with a black header are a-OK.
Those with an orange header are off limits.

Black heads good, gotcha.... Wait... :>

WHATTTTT!!!!!!! LOL JK LOL

The prize support ATAs for BatB (well my venue was giving them away as prizes) all have orange headers...

And it looks like those actual cards are not legal since they are still considered feats and the wordings have been changed. Wow.

Yup. Sad but true.

Golden Age and Modern Age follow the same rules. The only difference is Golden Age allows you to use any figures in your collection and you may use Feats, Bystander Tokens and Battlefield Conditions in addition to the Alternate Team Abilities and Figures allowed by Modern Age.

Some people get confused thinking there are 2 sets of rules. There aren't. 1 set for either Ages.

They have the correct script that an ATA requires. The only difference is the Orange Header. I don't see how that would make them "illegal"?

Plus WK has fallen asleep on the job by not producing any other versions.

You couldn't call them "feats" as they are now Alternate Team Abilities and must follow the rules as such. Here are the rules for Alternate Team Abilities (from Player's GUide pg 21):

General
 Alternate Team Abilities must be used and costed for all qualified team members on your force.
 Alternate Team Abilities cannot be used by a character during a free action granted by being successfully hit with Mind Control.
 Unless an Alternate Team Ability says otherwise, the team ability it grants is in addition to any other team ability the character can currently use.

Note, it does not say ATA's must have a black header and have their number begin with AT.

The BatB ATA's are all legal and do not need any change.

Bystanders from the appropriate sets are allowed in Modern Age. That would be from Avengers onward under the current scheme.

They have been banned.

From the Player's Guide:
While I don't think WizKids has provided us the tools that they should for Print and Play, they have provided these ATAs as black bordered ATAs. (Even if they haven't updated their own gallery.) Click here to get all the DC ATAs.

See above where the rules state that the orange bordered feat/ATAs are banned. (And the new black bordered ones don't list numbers since ATAs are not tied to a set anymore.)

Check with the judge at your venue.

Until Wizkids produces an actual real card to replace the old ATAs, we are still allowing the old orange ATAs to be used.