confused about muramana
so i was reading a guide on murmana syndra and how it her ult would activate it for every hit. but i'm kind of confused now, i got near the bottom and he says this
"NOTE: Now that Muramana does physical damage, I highly discourage you from getting this item! Buy lich bane instead if you need more damage! "
i'm kind of confused by what he meant. can someone explain
also is this consider a outdated guide now? http://www.mobafire.com/league-of-legends/build/syndra-a-new-look-for-season-4-292057#chapter1