The ExFighter

[Anthrowhale]

You see, there is an uncertain matter: was Protean really your body or not?

Mind Switch specifically state that "You possess the target’s body..." Possesion is ownership.

The form of doom example is irrelevant because the Form of Doom isn't possessed: it's temporarily transformed into.

True Mind Switch is instantaneous and hence undispellable.

ECL=HD+LA.

Nobody disputes this equation, rather it's application. However, I don't fully understand your position.

Do you believe that the ECL of a wizard changes everytime they use Shapechange?

What about the ECL of a wizard using Mind Jar?

What about the ECL of a druid using wildshape?

1) Violate damage. Bring it health below zero. Game Over.

How do you inflict the vile damage though?

2) Ni times empowered Ray of Enfeeblement. Tanglefoot Bag. Call the Headsman...

How do you penetrate the AMF and the immunity to magic?

4) Escape. Go home. Find out who attacked you. Cast the Teleport Through Time. Kill the Ex beforehand.

That spell has an extreme material component, and it's specifically suggested that the timestream reverts to standard. Hence, you make kill Ex, but another one will arise.