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
Field of the Dead then produces an army of 2/2s with every subsequent land drop once you hit the threshold, which is very hard to interact with and beat
Swarmyard has been in the deck since the mono-black days, but I have to admit I might end up cutting it because it can sometimes get in the way of trying to cast Garth due to only being able to tap for colorless mana
Exile that card, then that player shuffles
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Tifas power doubles through landfall triggers, but the key is that this card has trample