User blog comment:RoznosicielCiast/Is Siphoning Strike too strong?/@comment-3358335-20131105170355/@comment-6061249-20131105174326

Siphoning Strike is on-hit effect that causes him to deal bonus physical damage certainly on his next basic attack enchanted with Siphoning Strike. Technically, he performs a basic attack with bonus damage from Siphoning Strike - it's not a targeted/autotargeted/skillshot/blank point area spell. On hit effects are counted into basic attack, i'd even call it single hit buff, so there is nothing wrong.