Suggestion: Hero Refund / Hero Testing

Would be nice if developers of this game added function to test hero before buying it or refund(max x3 refunds overall like in league of legends) hero after buying it. I bought 'Sweet Science' and i didnt like it.. It was so hard to farm that hero and now i would like to refund it and get back my credits to buy or test another hero..



I hope you like the idea, and i think most of the players would like it. :)