No thanks, it is all about improving my skills for me. Winning a match and climbing the league ladder is all the reward i need to enjoy a fight and feel the thrill
since there were, on twitch , some heartstone player who played betting RL money , i think u can do at your own risk with your own trusted opponents in private without yelling at the world that u bid money.
or, if ubisoft would create such system for in-game-currency, it would be possible, and, likely, absolutely legally allowed. Or at least ways to trade in-game-currency with other players. Then it would work like in cs:go