If not for the challenges in casting Whir of Invention, it would be an excellent inclusion here, as we could use it to find almost any artifact in our deck at instant speed
About which packs to buy, actually it does not matter that much since the probability of getting what you want is low, but, to maximize it, Id recommend getting Amonkhet for Hazoret the Fervent, Glorybringer, Ahn-Crop Crasher, Magma Spray and Sunscorched Desert
Guided by Nature The green preconstructed deck was forgettable, but the two legendary permanents that came out of this deck are some of the most popular mono-green utility cards that have seen print: Freyalise and Titania
Never fear, though, Kilo does have plenty of cool lines that can be taken if you want a bit more spice when it comes to winning the game
Vivid Crag The Vivid lands are all functionally the same until they run out of counters