Find token cards by prefix

A lot of people only specify the base name of the card and get a blank token (see below)

![fail](http://i.imgur.com/RPFWzNR.png)

By looking in the `QHash` keys with a prefix, you can find the cards

![success](http://i.imgur.com/lcVC7uK.png)

I tested it and it runned smoothly on my end.