getting new heros

I have no problem beating some of the new heros the card will not drop. What is up with that. And the stamina you need to get a new hero is not though out well on tynon part. 1 time for 5 a day is plenty or raise the stamina up to 5 min for 1. Siralex

Just keep at it, some players will get the hero right away, some it will take 100 tries. Its not supposed to be easy or low cost.