drop $100 to $300 and hope that you don't get.. let me check my notepad... I'm now at 16/17 cards used that either failed or I was given an attribute that the hero can't use making it worthless and increasing the fail rate. Something to consider before you spend money on it. I'm also on 13 fails in a row trying to go from 4 to 5 stars on 1 hero that is suppose to have 45% success rate.