Edit* as of the last six months this game has been broken in the sense that every old hero is so underpowered compared to the newer heros they're all obsolete and then even if you pay and have all the best heros the algorithm for the boards is always stacked against you when the "random" color shields are generated theyre always"randomly" the only colors the player didn't bring in. I've played for years and I gotta say it gets worse by the update.