A few comments:
When I was playtesting my deck I didn't understand how to leave the playtesting first, because the "Leave" button is in the deck dashboard and not in the duel view. Even in the dashboard I find the Leave button is somewhat inconspicuous and so I missed it. This made me think I had to wait the 50 simulations before I could change the opponent.
Secondly: I like the card ranking system quite a lot, but it feels like you should have two rankings. One for play, another for targeting. I ran in to the problem: How can play out my Learn creatures before my spells, but avoid them getting flickered by myself (which removes all counters gained from Learn). Another example are cheap ramp creatures that I want to play early, but they shouldn't be the targets of my spells like heals.
Lastly: How can I change the image of my deck?





