If you can attack with two things the turn it comes down you will get an immediate return on your investment, and if Landroval makes it to your next turn, it is very easy for you to attack with two things, since Landroval counts itself
I think this one will hold its price fairly well, especially if it makes it into a tier one or two deck, which is quite likely for a land that can trivially make 2 mana
But safe to say that whatever its doing, collectors are here for it
We answer that complicated question by taking a look at Magics different formats, the decks that see play, and how much of your well-earned money these piles of cardboard will run you
Pre-Release Events You can pick up Whispers in the Well one week early at your local game stores pre-release event, where you can also earn exclusive promotional cards