Firstly, Myriad Landscape is only legal in Commander, Legacy, and Vintage. It comes into play tapped, but can then sacrifice itself to seek out two basic lands of the same type and put them into play for only 2 mana.
The major advantage of Warped Landscape is that it comes into play untapped, meaning you can tap it for mana as soon as it comes into play. It also lets you sacrifice it for 2 mana to get a basic land into play tapped. That’s the same mana investment as Rampant Growth, but it requires that you play a land in addition. Still, at the very least, this land can go into literally any draft deck. While it’s not as good as Myriad Landscape, it easily sees play in Commander.
Did Warped Landscape see play in Standard?
With the Khans of Tarkir fetchlands no longer in Standard when Shadows over Innistrad arrived, some speculated that Warped Landscape would be good for Battle for Zendikar-block Landfall triggers. It's good that you can play it and use its ability in the same turn for two triggers. So, it was possibly that it could see a smattering of play. While the basic land coming into play tapped puts it on par with a land like Evolving Wilds - although Wilds doesn’t tap for mana.
Still, you can’t ask a lot from a non-basic land printed at common. It definitely was a high pick in Shadows Over Innistrad drafts and sealed deck tournaments, especially in top competitive play. Shortening your deck and fixing your mana is always going to be important, especially when mana fixing is at a premium. But Warped Landscape didn't make the cut in competitive Standard deck.
Does Warped Landscape see play in other formats?
Somewhat predictably, Warped Landscape has seen a fair amount of Commander play, especially in the Landfall-happy Omnath, Locus of Rage decks. Getting two 5/5 Elemental tokens is pretty good, after all! It sees play in a lot of lists, and while it's not an optimal play in the competitive Commander environment, it's still a card that people jam into EDH decks well into 2017.
According to deckbox.org, Warped Landscape is still added to decklists all of the time, even if they are casual, "kitchen table" type decks. Mana fixing is always good to have, especially when you're working with a limited pool of cards. This is always going to be a great common land to have around and being colorless, it can fit into pretty much any deck if need be.