I have also found that every time I find a legendary hero in the tavern it always seems to be either to the left or right of the card I choose after the shuffle. I've wrongly chosen too many cards for it to be just luck in my opinion. But it obviously doesn't happen to everyone.
always go to the side closest to the edge. for example if i get valla pop up and shes one card from the furthest right, i click the furthest right. if they are in the centre, go left. i find that works well especially with the female toons.
SLAYIN A MANY MUCH STRONGER THAN I...I AM A DREAMER...AND DREAMS ARE WHAT LEGENDS ARE MADE OF...