I understand the frustration of entering a tournament knowing you won't be able to finish at the top spots.

But i think most of the 'solutions' you've come up with already exist in some form.

See, as a silver league player i could enter the tournament below. But i would pay way more entry fee than a bronze league player would. I would have to get in the top 16 to break even on the entry fee, whereas a player in bronze/novice league would have to finish 128 or higher to profit from it.

Not a hard restriction, sure. But definitely discouraging.

Also if i were to join the tournament below, restrictions on monster/summoner levels would be in place already. depending on the league chosen by the host.

You're saying that card levels should be adjusted to either the lowest or highest level available for both of the players to keep an even playing field

Though if you were to do that why would you even combine/ level up cards in the first place? There wouldn't be any benefit in doing so, right?