That's simple. Just go to the "Extra" tab on http://hearthcards.net/ and convert an existing card's cost into a tavern tier!
Remember that only a minority of regular HS cards would make sense in this mode (no spells/weapons, no card draw/deck interaction, etc...).
Here a some examples which I think are...interesting. Mostly because the same effect leads to a very different outcome!












Do note that in Zola's case, the golden minion will be the upgraded one!


































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