Is this the card that reveals the identity of the Last Jedi?

Nope.

But we all know Luke is the last Jedi.  It says so in the Force Awakens crawl.

Anyway this is the Truth Gun.  Not only does it Jedi Mind Trick your opponents into revealing their secret cards, it is the only weapon that combos with every single faction in the game.

Players have tough early decisions as long as the Truth Gun is still hanging around the Power Tree –especially Monster Players.