Blade Armor Ninja only requires two level 4 warriors, so it can be used in any deck running warriors. Obviously, it is best used in a Ninja deck as it can then target more than just itself. One interesting thing to note is that it is also a wind monster making it useful fodder for Dark Simorgh.
 
There are several was to get 2 level 4 monsters on the field in one turn. Goblindbergh can special summon another level 4 monster from your hand. There are several warriors that can be special summoned from the hand that can be a level 4, like Photon Thrasher and Level Warrior, and as luck would have it, are light monsters for use with Chaos monsters. There is also a trap called Copy Knight that can be a level 4 monster if you have one on the field.
 
Blade Armor Ninja would work well in Laval decks as well. Laval Cannon can special summon Laval Warrior, Gunner, or Cannon. No matter what deck you run Blade Armor Ninja in, the ability to attack twice with 2200 attack and destroy up to two of your opponent’s monsters is not too shabby.
 
Traditional: 2/5
Advanced: 3/5

Blade Armor Ninja

What was first thought of as a card just for Ninjas, turned into a powerhouse for Samurais as well as Heros. Easy to summon in all 3 said decks, and could hit for 4400 damage. If your opponent played Solemn Judgment, he is game. They could even use Warning, and I have seen people win that turn. My question is, will this card turn out to be too powerful for the game? While it's base stats aren't scary, the chances of you doing a big turn just increased by a ton with these decks. Get at least 1 copy for any of the said decks

Trad: 1.5/5
Adv: 3/5

Blade Armor Ninja
Warrior/ Wind/ Rand 4/ 2200 ATK/ 1000 DEF
2 Level 4 Warrior-Type monsters
Once per turn: You can detach 1 Xyz Material from this card to target 1 face-up "Ninja" monster you control; this turn, that monster can attack twice during each Battle Phase.

This card is the go to xyz monster that ninjas can resort to. If you manage to get rid of your opponent’s field and know that their S/T zone doesn’t hold anything too critical, you can essentially deal over 4000 damage in one turn. Granted that this XYZ monster does need 2 warrior monsters, you can take two routes with ninjas.

1.       Special summon Armored Ninja Earth + summon Armor Ninja Wind
2.       Summon Golden Upstart Ninja and activate effect to special summon a Lv 4 ninja.

At the very least, this card can place a good amount of pressure on your opponent and can end games quickly if your opponent doesn’t have any good answers to this card.

Pros: decent attack, a ninja can attack twice by dethatching an xyz material.
Cons: Substandard attack for a rank 4.

Thrusday:

Blade Armor Ninja
Rk 4/WIND/Warrior/2200A/1000D
"2 Level 4 Warrior-Type monsters
Once per turn: You can detach 1 Xyz Material from this card to target 1 face-up "Ninja" monster you control; this turn, that monster can attack twice during each Battle Phase.:

Another Wind monster for today, and one that uses one of the two main mechanics that always seem to be on Wind monsters more than any other Attirbute: the double attack feature. There's lots of Level 4 Ninjas to use for him, so getting BAN out isn't too difficult. He works well as a game ender as he can even make use of his own effect. Sadly, however, his stats aren't great for an XYZ monster. It seems that once again, WIND has gotten hosed over for other Attributes. The one thing that helps offset that is the fact that he can dish out up to 4400 damage in a single turn.

I wouldn't be surprised to see him splashed into Warrior-themed decks, but he works great in any Ninja deck, too.

Traditional: 3
Advanced: 3.5