I've just been playing with the core set so far and just had one basic question. The last game I ended up with both a sneak attack card and a gandalf card in my hand and this seemed an amazing combination. So i paid the 1 resource to play the sneak attack card during the combat round and as Gandalf enters play he hits a troll for four damage and then actually does his combat phase of 4 damage to the troll and then goes back into my hand at the end of the phase. I figure i'm playing this right but it just seemed too good to be true. Anyone interpret those cards differently?