I'm pointing out Kaya mostly because "Its not Dack" is just about the silliest argument against this. Its like all the people that yell "Its not JtMS" for every 4 mana walker. You are better than that.
This feeds your DRS/Tarmogoyf, mana denies any Fetch lands your opponents play later in the game, shuts down game ending spells like Tinker/Dark Petition, stronger hate against Dredge as it nukes their entire yard (when combined with DRS or Wasteland should be game ending). Kaya is the latter, but that's it. If you don't want to play it that's fine, but it serves similar value across a number of matchups as these other 3 mana walkers. I can understand Kaya #1 being better in that list, but drawing this instead of a 2nd Kaya would be a benefit towards fueling Kaya's ultimate.
This is also playable in Landstill (or any other wasteland based control) the 1-sided Mindlock Orb effect against storm and -1 is very strong against Dredge. Both abilities play well with any strip effects, e.g. Wasteland/Ghost Quarter/ect. Her -1 is also synergistic with Crucible. It is highly matchup dependent though so I don't think this is a make or break card for these decks.