Quest mode - Play with easy AI in higher level

Hi everyone,
In short: In quest mode, how can I play again with easy AI to test my new deck.
My problem is Im new with MTG, it take time for me to build and test a new deck. In my quest, I only use only a deck go up to the level that include hard AI decks. I build some new decks and test with AI but hard AI dont let me do that. Its hard to test my new deck, AI finish me to fast or come with some sick strategys.
Dont make me wrong, you guy do a good job here. Im very appreciate it. I enjoy a lot contents in quest mode but I dont want lose money for test new decks. Most of offline card games allow player play with easy AI even you completed the campaign
If it violate some pricipals of developers about this game, thats ok. Then can you just tell me how to change it by myself, like copy-paste some files.
btw: happy new year
In short: In quest mode, how can I play again with easy AI to test my new deck.
My problem is Im new with MTG, it take time for me to build and test a new deck. In my quest, I only use only a deck go up to the level that include hard AI decks. I build some new decks and test with AI but hard AI dont let me do that. Its hard to test my new deck, AI finish me to fast or come with some sick strategys.
Dont make me wrong, you guy do a good job here. Im very appreciate it. I enjoy a lot contents in quest mode but I dont want lose money for test new decks. Most of offline card games allow player play with easy AI even you completed the campaign
If it violate some pricipals of developers about this game, thats ok. Then can you just tell me how to change it by myself, like copy-paste some files.
btw: happy new year