Stats from games
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I remember the old ranked system, before the re-launch, where you could see your stats from previous ranked games - such as winrate, gold earned, creep score etc... I thought this was a really good and handy system that let you improve indirectly different parts of your personal game. My hope is that this is imported back to the next season, season 8!
EDIT: It was also quite fun too keep track of your stats! [slayer-pantheon-thumbs]