It would make the decks a bit more fun and I would personally enjoy it
Do you mean your specific decks use only one selected hero portrait?
You can do that. When editing your deck, on the upper right of the card selection screen, there are two tabs. One for a specific Card Back for that deck, and one for a specific Hero Portrait. 
Hope that helps!
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No I mean whizbang since he uses normal hero when I prefer my skins