I presume it makes creature cards in your deck into artifact creatures so that you can potentially search them out with something like Kuldotha Forgemaster or Magda, Brazen Outlaw
( Saviors of Kamigawa is particularly unthrilling.) A perfect example
Sorceries, instants, enchantments, creatures - it doesn't matter
If you pay two generic mana when tapping Three Tree City, you can generate a ton of mana for any color equal to the number of creatures you control that are a certain type
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This has officially supplanted Feed the Swarm as the best black enchantment removal spell, and it's just fine as creature removal when needed