Letting player chose their cards' appearance would require a lot of development for very little, so it's highly doubtful it would be added to the game.
However, we're not stranger to make slight changes here and there on card pictures or effects, such as the class-related appearance effects that were added in the Necros and Paladirs expansion. So feedback is always welcome on these matters.
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Ankama Trackers
The shinning effect of some infinite cards in level 3 is awful
By BreakTower#8845 February 14, 2017, 11:53:19
AnkaTracker
Such as Amalia level 3. It looks like some golden silk thread running aroud her. or even worse ,golden roundworm? I know , it is energy or something ,but can the art desigining makes it more
nature?
It also has a much easier way. Can the players have a choice to show the orignal apperence of the infinite cards without shinning effect?
First Ankama intervention

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Letting player chose their cards' appearance would require a lot of development for very little, so it's highly doubtful it would be added to the game.
However, we're not stranger to make slight changes here and there on card pictures or effects, such as the class-related appearance effects that were added in the Necros and Paladirs expansion. So feedback is always welcome on these matters.