If there were any lands that were also artifacts before the abilitys effect applied to them, those lands would become artifact land creatures, not just "creatures," or land creatures. The effect allows them to retain both the card type artifact" and the card type land. In addition, each land affected by the ability retains any land types and supertypes it had before the ability took effect
Power has a lot to do with it
Kydele, Chosen of Kruphix & Eligeth, Crossroads Augur Alena, Kessig Trapper & Gilanra, Caller of Wirewood Sakashima Yeah, this one's weird and gets its own category
We say 'officially', because we got a sneak peek into some of the coming cards a couple of weeks ago, amid the Jumpstart: Historic Horizons spoilers, so these aren't actually the first new cards we've seen for the set - but Thursday was the first official day of the preview season, and we're incredibly excited to see what else the set brings, given how many cool cards we saw in the first 24 hours (don't miss Wargamer's exclusive spoilers, including wolfy Enchantment Howl of the Hunt) The point is, we're about the enter a prolonged spooky season courtesy of Innistrad: Midnight Hunt, with this set telling the tale of how the humans of Innistrad are coping with the nights getting longer, and the creatures of the night - specifically werewolves, in this set - becoming more powerful, and seemingly far hungrier too