Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
Janna Kiting Build
-Something different, something extremely fun!
-500+ Movement Speed
-If played properly, almost 0 deaths per game.
-Tons of assists, but not alot of killing blows
Try it, it's really fun!
Experiment with the frozen mallet, and when to get it. If you want more AP early on, go straight for lich bane then archangel's staff, getting the mallet aftte those two items, (i.e. toward end game). You don't NEED the frozen mallet, but it will get you TONS of assists since you will basically out-speed everyone on the map and slow them down with the mallet. It also gives you 700 health making you unkillable until late-game, if at all.
Lich bane also gives you 7% movement speed
Lets do the math
4.5% Movement Speed from Quintessences,
+3% from Tailwind (Passive),
+16% from Zephyr (when maxed)
+7% from Lich Bane
+Boots of Mobility (Or Swiftness, up to you)
note: Phantom Dancer gives you +15% too, but we won't go there, lol.
Have fun! :)