Does not work as stated by Site Director perculia
“There’s no API available for Hearthstone so our tool options are more limited. (Wowhead addons help out with droprates/locations.) The database section is from datamining, but the arena practice tool for example was generated by watching a lot of games and noticing drafting patterns. If an API is ever made available, there’s lots of cool stuff we could do :)” http://www.wowhead.com/forums&topic=222118/how-does-hearthhead-get-hearthstone-data
Can’t help you out with this, sorry. Try linking maybe?