You may even find the original schematics, with Retro-Frame Artifact cards featuring alternate art that showcases the inventors sketches and designs
as well as non-combat reuse of comes-into-play creatures (Jilt your own Flametongue Kavu, perhaps?) Barrin's Spite was a rare in this block and served generally the same purpose as Jilt, except that Jilt was an instant, and Jilt allowed you to unsummon your own creature if need be
The information found inside the app can be analyzed, which can hint toward what might be coming to a game in the very near future
For example, say you control Gandalf the Grey and have chosen the first two modes
A good way to make your Scion of Urza really pack some punch
If you're starting out, you likely will not touch Legacy any time soon, if ever