Weird that that they included this as part of the OTJ story when it is like a year overdue from the MOM story. Oh well, it was actually pretty well written and provided some necessary explanations.
Edit: Just noticed that Alison Luhrs wrote it. That makes sense since she really nailed the Jace/Vraska relationship from the beginning. The original Ixalan stories are some of the best MTG stories out there.