For a first pass at unrestricted starters, check out the ratings Card Ratings: the Starter Decks, but consider spell costs increased by 1 (and therefore down ~1.5 letter grades).
Neutral stays the same, since it doesn’t suffer the spell penalty
Purple is the same, since it’s spells aren’t useful without other Purple spec support
Red, Green, White, and Blue take a hit, as their spells aren’t really worth it at +1 gold cost, and their spells are kind of important to the starter deck power level
Black comes out OK - Deteriorate at 1g and Sac the Weak at 3g are still just fine.