citybug7

Thinking of Elspeth bringing the Sylex back to Alara in that split-second planeswalk away, she could bring it back to Alara noting her history on the plane. And in that instance, the use of the Sylex could trigger the second Sundering of Alara -- allowing WOTC to fix the united Alara and giving the plane back its old gimmick of Shards.

Maybe there's some time-loop shenanigans with Teferi -- and Elspeth brings the Sylex back to Alara before the Sundering, and this was the source of the Sundering. Considering the lore still features a presently unknown planeswalker as the cause of the Sundering, this is out there but an interesting twist.