Subject to change...Im kind of a noob so any help would be appreciated...
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I don't get Phantom Dancer. You can get plenty of dodge without it, and you only need one dodge to trigger the availability of it. The move speed seems redundant with Leap, I prefer getting attack speed from a Guinsoo's Rageblade + Last Whisper/Nashor's Tooth depending on Physical/Magical DPS choice. It doesn't contribute at all for your passive.