In the next few weeks and months we'll see if the hype truly is cooling off with this set, or if the heat of these Phantasmal Flames is not missing, but just delayed
What the sac lands offer you if you can be bothered with all the shuffling and changing of life totals is a reduced chance to draw further lands, an extra boost towards threshold and fuel for your Lavamancer (if you are playing Geopede you should obviously play every sac land you can get to the point of playing things like Badlands and Blood Crypt simply to use off colour sac lands but this seems a little over the top for one card)
For that reason alone, Fetch Lands might be the most influential cards you find in Eternal formats period, maybe even more fundamental than Black Lotus in Vintage
Nobody wants to watch you tediously flip coins one at a time
And the other cards seen through the trailer look pretty, I hope there's definitely a healthy split between reprints and new arts, which it looks like there will be, with the new irs being stunning