Its used to keep threats under control, to interrupt combos, and to prevent players from snowballing out of control
Demon-focused isnt a bad option, but the cost reduction can let you do red-black good stuff if thats more your style
Set Breakdown: 6 Leaders
With that said, having a deck that needs to shuffle its graveyard back in routinely is not what I'd call a commonplace problem, so it's interesting to see this particular niche raise its head this high up in the top ten list
Stop that Magus of the Wheel or Jaces Archivist from discarding your great hand, shut down your opponents protection plan by paralyzing their Mother of Runes and prevent that Weathered Wayfarer from finding more potentially crucial non-basics
Add in discard outlets like big creatures with Cycling (which you can grab back), Golbez, Crystal Collector's own Surveil ability, and old classics like Bottomless Pit, and we've got a nasty little engine here