Sort:  

Oh I see, definitely missed that part of your post.

I'm in favor of soul locking cards tbh but I'm not really sure I agree with limiting to only max level cards.

Although 'free to play' or generally low investment players could be argued to hurt the game economy it has been proven that low level players that may only spend marginal amounts on the game are critical to stick around and this would effectively end the idea of progression for those players which ensures they likely spend $0 instead of the $5 to $10 here and there which is a detriment. These types of games require at least some form of progression for all levels of players or else that addiction loop that keeps people coming back breaks and you lose players.