The real advantage to this card is that you can leave your creatures unburrowed without worrying that the opponent will kill them by CC.
So you could play shriekers and just let them sit there unburrowed, dealing full damage. If your opponent tries to shoot them, they autoburrow.
Basically, it forces the opponent to waste a targeted effect in order to force your creatures to burrow.
...Of course, just like with SoFr, they would not be protected from mass targeting like plague or firestorm, so there would still be reasons to burrow them proactively.