Not Updated For Current Season
Nasus - Skills
As Nasus i just make sure to get my Q(Siphoning Strike) in level 5 so fast that i can.
Then my Wither and Spirit Fire.
Nasus - Summoner Spells
For summoner spells i use Teleport and Ghost.
Ghost: To get away as fast as i can, or just to gank(to get slow on fast!)
Teleport: I use teleport to gank(If i have wards behind or right at them, they cant see me cuz its in stealth) or just to get in lane fast to get XP.