There's a 35 MAG rod from the Illusion of Bahamut event, a 60 MAG rod from the Giant of Babil event, a 72 MAG rod from the Lien Chan Battle (no idea if that translation is correct) event, and a couple TM rods (90/109 MAG) from units we don't have yet. No way to tell how soon, if ever, we'll get those events. GL isn't following the same release timeline at all.
I'd say it's worth farming at least 1 rod, but then again I have 4 Kefkas and a Tellah so it's unlikely I'll ever regret it.
Speaking of Tellah... this troll game never ceases to infuriate me. Pulled a few times this morning, got 2 Lennas (who is basically Fina++ so that's cool) and then my last pull was a gold crystal. Warrior of Light?! No, it's a fucking 4* Tellah, of course.