As its status as a massive red dragon would indicate, its a very popular card before and after the reprint
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Urgent Schedule would be extremely useful for the Deck, being a Quick-Play Spell where if the opponent controls more monsters than you, you can summon a Level 4 or lower and a Level 5 or higher EARTH Machine directly from the Deck with negated effects, quickly giving you two bodies for your Xyzs
Based on Japan's Clay Burst and Snow Hazard sets, it features 279 cards
While that's not the most terrible idea, the likelihood in a Niv-Mizzet deck is that the other spell you're casting is a burn spell that could do the same, and I have to feel that you're going to be better off casting it by itself, rather than putting all your eggs in one basket