scr mage without blizzard!?

[Peril]

The top 9 mages on my leaderboard are scr mages that do not run blizzard, but do run immolate. Would someone kindly explain this to me?

[Nhat]

I don't play mage much, but I believe they are getting the "Lightning Struck" (which normally come from Blizzard with the set) effect with the Belt of Whispered Secret - apply when dealt damage with Deflect.