Very few of them do anything beyond existing for combat
Well, Tazri has only white mana symbols in her mana cost, so that works so far, and she doesnt have a color indicator, so were in the clear there, but she has that ability that costs WUBRG to activate and that sadly means she has a white, blue, black, red, and green color identity and cant be a member of Dromokas deck
The Eevee Heroes set (Japanese) versus Evolving Skies (English) is a classic examplethe Japanese cards have different textures and holo patterns that many collectors consider superior
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x1] This Character gains [Blocker]
adding little to nothing on their own but creating huge efficiency gains whenever they can recur, protect or fizzle a more important card for a fraction of its total mana cost