Proving Grounds Suggestion

For the first time I joined a players who are unable to play proving grounds since the rewards are maxed out. 

I am disappointed because I enjoy the content and challenge. Would be fun to test our rosters even without rewards in that event. Or you could give us 1 omicron or zeta per battle. 

Either way I’d just love to see proving grounds be replayable and useful to both the devs and players. Players would be incentivized to spend on refreshes and on characters to get to the omicron tier.