I feel like it will definitely see play, considering that almost every value card (such as DKs, stonehill and many others) is leaving, and there's many good minions in mage list. Like 3 mana 3/2 discover: Toki/Water elemental/Apprentice still might be pretty decent sometimes
Stonehill Defender and Stitched Tracker saw play, because they could consistently pull a great minion due to their restrictions (taunt and minion in your deck), so they worked in certain classes and certain decks, this card does not have that consistency and most options will be extremely average.
You don't have to craft or run slow, expensive mage legendaries when you can just discover one or use it to discover a water elemental vs. aggro decks. Great card like stonehill defender, but I will run this instead in my renomage.