It needs to be at least 1 non-basic land destruction in every standard, at all times.
A bunch more non-basic land destruction if possible, but the corner stone to not be dead in the pool is to have an answer that is viable for all decks.
Field of Dead was a problem and every land that turns into a issue has to have a answer, if not, bad things happen.
The book should say the ability only works while its a creature, the fact it doesnt produces the same combo with Mutavault, even better as its cheaper.
The fact its not a persistent problem in older formats is the simple existence of land-destruction, proper counterspells and removal.
There is a nonbasic that destroys lands in standard currently. It's actually a pretty good one, sees play in multiple formats.
The issue is, that mechanics like Adventure and Escape create so much inherent card advantage without costing any tempo loss at all are highly prevalent, so sacrificing a land, or risking being stuck out of a color is too high a cost to include Field of Ruin.
Or, you know, the fact Field of the Dead is not legal in Standard 2022. You know, the *Arena Only* format where they let people play with only cards that will be around after the rotation? The only one that Book of Exalted Deeds has been banned in? The one without a single card with Adventure or Escape?
And they were doing so well with sets released in 2021 so far.
Like why ban it for Standard 2022 and not for the format moving forward post-rotation? The combo pieces will still be intact so how is this any different or going to solve anything?
Future Future League needs to be reintroduced.
'buster
Either there's something that will solve the problem in Innistrad: Midnight Hunt or they didn't want to reveal that there isn't. All it takes is a Field of Ruin or Ghost Quarter reprint or something similar.
Could also just be they want to wait and see how it is with IMH since they noted the deck isn't that good.
It's also specifically being banned because it's a Bo1 format, which prevents sideboarding in solutions to it. Even bad land destruction could chase it out of the format if it threatened to be a problem in a Bo3 format. I'd be very surprised if this "combo" is a concern moving foward.