A question about sheen proc (spellblade)

I've seen many players especially nasus players do this where they build along with . My question is which spellblade procs if some1 has both and , and also if some1 has all the 3 and which sheen will proc, as all of them do different things. Better yet, if is also in that build which one of those will proc as all of them have the same unique passives.