Single Raised Pot. FLOP: Qh8s6s Turn: 9h (could have the suits wrong but there was 2 flush draws on turn)

Phil was in position and cbet and was called by trueteller. 

When the turn 9 came off bringing a second flush draw to the board both players went check check. 

MY QUESTION FOR EVERYONE IS: if you were truteller and you happened to hold 93o what river cards would you lead against Phil and why (if any)? What could Phil have here?

I hope people think this is as interesting as I do.