If you say master y does low dps, you're doing something wrong.
He aint viable cause no cc, lack of escape, and fight control.
But he can still 1v1 anyone, splitpush, and a good jungler thanks to Q.
About build go for; Static Shiv, Trinity, BT, ASpeed Boots, GA, IEdge.
Late game, sell Static and buy Phantom.
To get kills, simply don't start the fights, or you will get killed whithin 5secs~, wait for your tank/initiator to start the fight, wait 3-5secs and then focus their apdc or adc, R-E-Q-AA-AA-AA-Q-AA until you're done.
AA - Auto Attack.
For masteries, if you're jungle take 9-21-0, if you're toplane 21-9-0, runes can be standard AD/LSteal runes.
Good luck
