She is simultaneously advancing the graveyard and the battlefield with one trigger
Past Modern Horizons examples include Yawgmoth, Thran Physician, Crashing Footfalls, Urza's Saga and Ragavan, Nimble Pilferer
You can hose a good portion of Boros Energy, countering key pieces like Unstable Medallion, and shut down Ruby Storm's combo by halting its card draw spells (sadly, it's useless against Grapeshot)
Sure, its pretty much dead on arrival if you play it against any Steel deck on curve, but the card is also inkable, which means you can easily put it into your inkwell and focus on better threats
Cards like Possibility Storm, Grip of Chaos, or Warp World dont just make it harder for opponents to think ahead: They make it essentially impossible since they completely randomize several aspects of the game