Just wanted to confirm that you can use the Darth Vader crew card totrigger show you the dark side?

No, you can't.
The condition is triggered when receiving a critical damage during an attack.
Vader crew is an "after an attack" ability, meaning it's not in the attack.

2 hours ago, Willy Jarque said:

No, you can't.
The condition is triggered when receiving a critical damage during an attack.
Vader crew is an "after an attack" ability, meaning it's not in the attack.

And this is specifically straight from the FAQ so there's no debate on this point.