Ninjas...

The Engine:

Ninjitsu Art

Upstart Golden Ninja

Hanzo 

Card Summaries:

Hanzo is a floater with two different effects when normal, flip, and special summoned. The most common card the this card will search is Ninjitsu Art of Super-Transformation which when properly utilized is game breaking.

Upstart lets you special summon any ninja level 4 or lower from your deck by discarding a trap.

Ninjitsu Art of Super-Transformation is Ninjitsu Art of Transformation on steroids that sends your opponents monster to the grave and a face-up ninja you have monster to special any 1 Dragon, Dinosaur, or Sea Serpent type monster that is less than or equal to the combined levels.

Concept:

Step 1. Normal Summon Hanzo search and set Ninjitsu Art-->Step 2. Activate Ninjitsu Art and target 1 face-up Ninja and 1 face-up monster your opponent controls and send to grave to to make target monster-->Step 3. Exceed whenever possible.
Else.--> Use Upstart exceed into a rank 4.

Ninjitsu Art opens up options that didn't exist, speed, search-ability, and play-ability. It's limitations are your imagination. As of now, the most popular builds in the O.C.G. revolve around exceeding into but not limited to Evolzar Laggia and Evolzar Dolkka for obvious reasons. Rescue Rabbit is in the build to consistency while Jurrac Guaiba and other Normal Dinosaurs are targets for Ninjitsu Art.

Counter:
Your best bet is stopping Hanzo searches and siding into monster and backrow hate.

Thoughts:
This archetype is just a fun deck. It's lack of consistency is this deck's undoing, but give them too much space and they will make you pay with Ninjitsu Art.

Honorable mentions:

Aqua Armor Ninja
Masked Ninja Ebisu
Earth Armor Ninja
White Dragon Ninja
Armor Ninjitsu Art of Freezing
Ninjitsu Art of Duplication

Disclaimer:All images will be updated as they come, credit for images goes to Wikia