This situation popped up in a game this week. Player A had a team of 1 mystic and 3 wild cards. All wild Cards were copying the mystic TA When player B mind controlled The mystic figure. The mystic turns to hit one of the wild cards, and the hit is successful. Does the wild card figure still have the mystic TA at the time of the attack? Or since the mystic figure is being mind controlled and has become on opposing figure for that action, the wild cards all lose the TA? ( I think I typed that all out right)

I believe that team abilities are optional so I bet it doesn't matter, the player just decides not to hurt his own piece.

Iirc, wildcards keep the copied TA until they decide to change it, or until the source of the TA is ko'ed. As interesting as this situation is though, it is completely moot because it is completely legal to turn off TA's after a successful MC attack.

This is correct.

Other oddities with this:
1) I MC your wildcard. When I give him his action, I have him copy the Ultimates TA from my Captain A. After the action resolves and Doom returns to your team, he can keep using that TA until he changes or Cap is KOed.
2) I MC your Mystic. When I give him his action, I have my WCs copy the Mystics TA. My WCs continue to retain the TA after your Mystic returns to your team.
3) You have a Saboteur. I MC him. When I give him his action, I have my WCs copy whatever TA I choose. After the Saboteur returns to your team, my WCs continue retaining the TA that they just copied.
This is incorrect. EDIT: Misread what was said. It is correct.

While I highly disagree with it because it flies in the face of the rulebook, the ruling is that MC is the excpetion to this rule. EDIT: The rule that you cannot change TA's in the middle of an action.
Page 7: "Resolving an action includes completing any free actions the action allows."
Page 18: "Wild cards can use only one team ability per action."

On the free actions granted within MC, you can do the things that normally can only be done on the "outermost" action.

From the rulebook:
I would think that once the Mystic TA holder is successfully MC'd, he is no longer friendly to the WC's, therefore they would lose the use of the Mystic TA. I couldn't find anything in the Player's Guide to refute this. Anyone else?

Edited: This is incorrect. See Harpua's post above.

Just like "cannot be countered" has multiple meanings, copy a TA has many ways.

"Copy a TA" can mean two things:
1) The act of acquiring the TA. (I copy Mystics from Ragman.)
2) The state of being where one is holding onto a previously acquired TA. (I am copying the Mystics TA that I got from Ragman.)

When it comes to the line you quoted, it was ruled long ago that it was referring to (1), the act of acquiring the TA. After that, you are "retaining" the TA (even if we still say that we are copying it).

Once I thought about it for a moment I understood the "how" and "why" of it. Makes sense now.

Ah, yes... the multi-layered meanings of the english language.

There are some days where I seriously think we might all be better off communicating entirely via interpretive dance. At least then we get a little cardio workout while being misunderstood

Yes, the problem was the player with the wild card figures never turned off the TA's after his mystic was mind controlled, then when the wild card was hit, the mystic figure took damage from the wild card because it was still retaining the TA. He just assumed that since the mystic figure was now an "opposing figure" it would not work. That's why I posted this, to see if my ruling was correct.
And I even picked up some new tricks. Thanks everybody!

Yes, English is like onions in that way. That and they both make people cry.

Very nice combos I have forgoten about that. Please refresh my memory on this as well:

You can give a MC'd fig an action and then turn off all his powers and TA at the completion of the action, correct?

Short Answer: No.

Long Answer: No because after that action resolves, the figure IMMEDIATELY returns to the opposing player's control. (See the PAC) There is no time after the action happens in which you can cancel the powers and TA's. You can, however, cancel as many TA's, and optional powers and abilities BEFORE you give the action.