Added to the original Greek? Seriously?
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We don't have any of the original Greek manuscripts, CynicalBear, only manuscripts of copies made much later than the originals. The earliest of those manuscripts do not contain that phrase, and scholars generally agree that it was not in the original Gospel of Matthew, but added later by copyists for liturgical reasons.
(Go to this Catholic web page, "Who Added The Doxology?", or to this Protestant web page, "The Lord's Prayer: A Guide for the Perplexed [Doxology]", to learn how that "Doxology" was added later to the actual scriptural text.) (Many other web sites contain that same explanation about that addition, and they can be found and studied by searching for Lord's Prayer Doxology on Google.)