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.
This build is purely for the purpose of fun and can leave your teammates angry at you for trolling if you lose lane. However, managing to pull this off can have nice results. With that said, I would not try this in ranked unless you are very brave or very confident. GLHF :)
AD nami may not seem very viable, but it is extremely fun (and sometimes hard) to pull off. Most people don't know how to react when they see an AD Nami top and often underestimate her. With the new masteries, thunderlords decree makes her very strong early in the the game with Nami's e-q-w combo. What mainly makes this build work is the slow from e and the cc from Q. If you land an E enhanced auto attack, you are able to harass quite well with minimal risk or trade. If they try to make a trade with you, throw aqua prison on them or use W to heal yourself and damage them a little. This may take some practice, but can pay off, and usually leaves you satisfied as you leave a riven completely baffled that a Nami had won lane.
To be efficient (and terribly annoying) with Nami, you need to make sure to make the best possible use of your abilties. You want to use your E as much as you can, as the slow it provides is very strong, and the added magic damage is nice too. A little tip for Nami's E is to only active E on your self AFTER you start the auto attack since the E will proc on the auto in mid air, which can catch your opponent off guard, instead of activating E and then auto attacking. Try and only use your Q after you land an auto attack enhanced by your Tidecaller's Blessing, since the slow makes it easier to land Aqua Prison. A good trade to make involves Tidecaller's Blessing then Aqua Prison and an auto attack. This does a lot of damage and procs Thunderlord's Decree . Mainly as AD Nami, you want to harass and not let your opponents get too close. With practice, you can win many matchups and seriously aggregate your opponent.
As this is my very first guide on Mobafire, I am not familiar with the process of creating a guide and have not gone very in-depth on item choices or masteries, so please forgive me for lack of descriptiveness. I will continually update this guide as I experiment more with AD Nami and maybe add more detail and explanation. I hope you have fun and thanks for viewing and if you like, add me on League. Summoner name is BCLegendary.