An iTCG has alot more potential than a mere TCG.

#1 - Developers can continuously balance cards and slightly change their values.
#2 - Since Eredan has card upgrades, developers can allow players to choose which artwork they prefer.

Here I'll focus more on #2.
I think you should have the ability to pick which artwork you want to use on each character of a particular deck.

Owning a character should unlock all the default artwork up to its current level.
If you have a collector version of the character, you have access to both the default artwork and that collector version.

This would be done from the Deck Editor - you'd click a symbol near the character and choose which artwork you want to use.

_________________
Suggestions: Rank, Elite and Ranked Elite Stats | AoE vs Greater Stats | Fairplay Sollution | Overcards