you cant get it if you use one. but next week before you use 1 put treasure hunter booster and play classic ( i normally find more in it) and i dont think you can get more than 1 ticket keep playing till you get one then use yr tickets. I think it drop when yr enemy use ticket and you kill him when treasure is droped you will find one. its hard but keep trying
You should not support the tournament because if nobody did, they would be free or a silver rating.
As of right now ND doesn't need to do a thing because your more than likely to buy a tickets at some point.