Not everyone gets what they want, or the first try. There are millions of combinations of heraldry, given there are about 1000 charges, plus ordinaries, field divisions, attitudes, positions and colors. There is a way to get something unique, even using 'common' charges. Not everyone should be the King of England!
Everyone needs 2 clear differences from all other SCA and recognizable mundane/historical heraldry. Be nice to the heralds who tells you that your proposed device doesn't pass the test, and move on to work up one that will.
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