Bout time I commented on this.
New content is great, but personally I do not like this idea. I forsee many problems with the main benefit being a cool pve task.
I'm glad you're thinking of new features and I like the trial idea, but I think the reward should not be customizeable marks. It should not allow you to chose photon and then make a photon nightmare deck to gain a crapton of quanta if your opponent plays any of the cards etc.... Maybe earn a rehand shuffle at the start of the game? Or a one time use precog or something?