Bob Ally
 

Is X equal number of Bob Ally include which one I try to play?
How can I register his Life? Just remember?
If someone play onother one is his Life change?

Re: Bob Ally
 

Not sure on two of your questions, but you can use tokens to mark Bob Ally's life

Re: Bob Ally
 

Yes, he counts himself for calculating X.

His life is the number of Bobs in play. If there's only one, he's just a 1. So if you cant remember how much life he has, just count how many are in play.

His life does change if more come into play or if others leave play.

I wouldn't recommend tokens, as tokens on Allies means damage.

Re: Bob Ally
 

I have Bob in play. My opponent play another one. My Bob life become 2.
Then my Bob take 1 damage. And then opponents Bob is squished.
Is my Bob life down to 0?