I noticed this thread :
viewtopic.php?f=26&t=21583I wonder if another solution would be to -not- automatically have the player moving to higher difficulty duels in the quest world he's in, but instead use some kind of portal system within a same quest world.
By example you're dueling with a new quest, whatever the plane you decided to play into from main, ravnica, zendikar, etc..., after a required amount of victory (set in the preferences), you would unlock a portal to the "medium" duels (or it could be a magic shop purchase as an alternative to set amount of victories ?)
But you're not automatically moved to it, you would still play in the "easy" portal, and only when you feel your deck is ready, you would then move to that "medium" portal.
Now let's imagine you're in "medium" and have enough victory for the "hard" portal to be unlocked. You think your deck is ready and move to the "hard" portal.
Imagine you're running into crushing defeat after crushing defeat with AI decks filled with cards you don't like, basically you don't enjoy it at all.
Then you can move back to the "medium" level and continue have fun.
I think it would be a good solution to that "decks with tons of power five and broken cards" problem for people not interested in having duels with cards like that.