The only way to find out is asking people who have the cards or play lots of challenges and get to know the cards
So.. If you are reading this, and have a maxed Leader, could you please post what it does.
I'm really surprised that there isn't a list somewhere with the info for all the cards.
All the Leader abilities are in the game rules, in the abilities and bounus section at the very bottom.
Well there is lol go to the games rules then charecter abilities and bonus's all the best
Ehm... the leaders are the very exception to this. There IS a list of them in the manual under abilities. (Contact us > Game's rules > Characters Abilities and Bonus). For the info on all the cards... I have an excel file that is 90% complete with all levels and abilites. Not sure if/where I'll put it online when it is finished.
ClintCity has an encyclopedia of the Cards init's wiki/playbook. It's still being built up but good progress is under way.