I have a feeling this may be the most over rated card since Greedo. Sure the effect looks great, but either you jump through hoops (I.e. Points) to proc the effect on a ship, or you don't and wait for the appropriate moment to trigger it (lots of conditions pending) by which time the ship is essentially half dead already.
Take the obligatory Emperor reference everyone is raving about. If you are lucky and the first face up damage card is it's first hull point you are already pretty close to killing the shuttle, and thus Palpatine already. Ditto for Soontir Fel. You just did a Crit to Fel, well then he is all but dead already. I can see some utility in getting rid of R2-D2 or other regenerators I suppose.
I think in practice this card will do a lot less than people think it will.
That being said, this is all on assumption that the ship that Boba is on needs to do the face up damage...but I'm not sure that is correct.
The trigger is "after performing an attack", if it had to be his ship the verbiage would/should have been "After this ship attacks" or "after you perform an attack". It seems you could trigger it after (an attack) that causes any face up damage cards, theoretically even after your opponents attack (if you felt the need to get rid of one of your own upgrades cards).
I haven't see this mentioned yet, but I imagine that many are as confused about it as I am.
Maybe he is better than I thought, but then again by the time he has any effect you probably don't need the effect I my opinion (short of junky combos like AHM and Greedo). It feels a bit like a win more card.