User blog comment:Bashfrog/Sion Invisibility Syndrome/@comment-5877442-20130729213920

I like playing underused champs too and Sion I feel is actually OK. AD Sion has things like kiting issues, but he can still perorm well in most situations. Early game damage is huge and you are good in late game due to your bonus health and healing through ult and lifesteal. With CDR, your stun and shield are huge-something like a 3 sec downtime on stun and a huge shield (with AP) with a tiny CD.

Viable? Possibly, but everyone should give him a try.