I have been playing this game for about 6 months. I like the concept and most of the mechanics, but.. And that's a big but. The game is mostly focused on P2W (pay to win) And the shards to to summon new heroes is extremely unforgiving and not willing to give. I saved up 10 purple shards and summed all at once. I didn't even get a single purple hero. The percentage of chance to receive a hero of purple or legendary is way to low. In my opinion that is the greatest downside of this game.