Modern Hebrew
While the words "mazal" (or "mazel" in Yiddish; "luck" or "fortune") and "tov" ("good") are Hebrew in origin, the phrase is of Yiddish origin, and was later incorporated into Modern Hebrew. The Yiddish pronunciation of "mazel" has the stress on the first syllable, the modern Hebrew word "mazal" has the stress on the last syllable, as is standard in modern Hebrew.