This NInja deck report was submitted and shared by Damarian Gaming on August 5th. He used this deck and reached KOG on August 4th.
Set Senior Silver Ninja to spam the board with other higher level ninjas and Beatdown the opponent. Use 3SD as a last resort as it is much more preferable to use Mausoleum but don't run Mausoleum at 3 as the draw ratio is perfect where it's at now.
3SD is my personal favorite for this ninja play style and I don't mind playing at 1000lp. Even if I'm up against a burn deck character, I'll be able to win as I won't use my flip to summing anything
Ninjas are also viable with Bandit Keith's Baggy Sleeves skill. I ran into this on my journey to KOG in Legendary Level 2. It's very strong and as potent as my 3SD build.
Play around your opponents cards with Duplication and Transformation.
Always steal a opponents set card during their end phase with a red dragon ninja if you have a viable target and its during the end phase of the turn they set the card through the use of duplication or transformation. That way next turn you can use RDN's effect again off a tribute or flip summon if you have one. That's minus 2 for your opponent typically leaving them weak and open for a Beatdown.
Main three flame armor as it's the only free normal summon able ninja that's viable for transformation and can also increase senior silver or RND to level 7 so you can duplicate them into a BDN whenever you choose. Also if you have a set senior with a flame armor and RND in hand; flip senior face up, only SS flame armor, and tribute summon RND using flame armor to have fodder for RND's ability.
Half Shut is maimed to keep you ninjas alive from battle if their attacked from being face down from senior summoning them. Before this, naturia was a heavy problem as their high attacks could easily kill of the ss'd ninjas due to their low def. Use the half shit on your ninjas when they're flipped face up during the dmg calc. You can also use this as anti mirror wall if you read it as a trap there earlier on in the duel or if your opponent is mako as 90% of the time it is a mirror wall. You can also use this to steal duels to push for damage.
If you don't have two or one half shut, swap in Gamashura as its the second best and I used that before half shut. It can burn your opponent for game and save your face down ninjas as they have high attacks.
If you have two Transformations, play the deck with 21 cards, the current ratio is perfect as is and I wouldn't swap anything out.
Black Drangon Ninja steals games heavily. Most duelist wouldn't realize this low key tech but I am a avid ninja player in the actual card game and know this tech all too well. Black dragon ninja can send one ninja and one ninjutsu art from hand or field to grave, banish one monster on the field and if BDN leaves the field, special summon those monsters back to the field.
This can be applied several ways. You can interrupt a opponents board by banishing a strong key monster on their field at the right time. But remember you did so try not to lose that same BDN otherwise that same monster banished returns!
The lowkey tech I found out is that BDN can target himself which means he can also resummon himself whenever you choose to do so! This can be done during an opponents e-con eff to take control of your monster. This can be used to STEAL games as if it's done during your BP, you can gain an extra attack with the BDN. The deck is extremely OTK heavy.
You can still summon flame armor ninja and make plays from there. Flame armor won't ever die as tea burn doesn't have a way to easily kill it meaning a tribute summon is guaranteed for you.
Weevil legit GOVES you tribute fodder. Also during their EP if they put a parasite on the top of your deck, if you have a set ninjutsu art you can use it and force your deck to shuffle before your draw phase which can save you the duel. It saved me one time.