I've been playing for three years and it's now at a point it's almost unplayable. It's so obviously fixed as you'll find many people saying. Even to a point that during raids, an enemy hero will have 0 HP and will still be on the board until they cast their special ability which will either be a massive group heal or high damage to wipe most of your team out. It happens all the time. There is so many suspicious events going on that I'd recommend not to invest time and certainly not money.