Not Updated For Current Season
buy a saphire crystal and 2 hp potions. go mid and last hit every single minnion to get fast gold. then buy catalyst of the protector to get some health then buy boots of speed.
now buy sorcerer shoes and then buy the 2 archangel staffs and the ring. try to gank ur enemies to get some gold. start with wall of pain and then use ur defile and spam lay waste.
note: check the map more often to use requim on enemies with low hp.
now ur supposed to have much gold and bought lot of ap so all of ur team push one lane and u win :)
i hope it was a helpful guide.