by Jenceslav
Well, there seems to be a whole thread around his house rules at Deskožrout.cz, but it seems that the downloads are only for registered users.And yes, these cards are somewhat improved to provide Improved Critical for two types (classes) of Heroes. His house rules and the text accompanying the improved cards is in here:
http://www.deskozrout.cz/topic/1061-house-rules-%E2%80%93-do...
and
http://www.deskozrout.cz/topic/1615-karty-pokladu-zmena-prer...
You have to use Google Translate, I do not have the time to translate all of it into english. It is in Slovak language, which is extremely close to Czech language ;) We shared the same country for ~80 years until we split :)