Thrummingbird An uncontested Thrummingbird is a scary turn-2 play
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While WOE won't hold a candle to the most expensive cards from the LOTR set, it still has some high-value stuff
My top picks for artifacts include the Gateway and the Urzas Incubator for all your tribal build needs, and Crawlspace for your controlling and anti-Overrun/Craterhoof Behemoth tactics
If it stops being a creature, perhaps because your devotion to its color(s) decreased, it will be a legendary blue enchantment with no abilities
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