Ally of Justice

"Ally of Justice" ( Ārī obu Jasutisu) is an archetype of DARK Machine-Type monsters who are empowered during the user's Battle Phase when the opponent controls LIGHT monsters. The trump card of the archetype is "Ally of Justice Catastor", who destroys any non-DARK monster in battle. The Allies of Justice are introduced in Duel Terminal - Synchro Awakening!! with further support in Duel Terminal - Invasion of Worms!!, Duel Terminal - Justice Strikes Back!! and Duel Terminal - Dragunity of the Hurricane. TCG-wise, they have been released in Hidden Arsenal. Because of their effects, which include gaining ATK and destroying LIGHT monsters, they work well with "DNA Transplant". It seems they have a relation to Flamvell monsters, due to the effect of "Flamvell Magician". They possibly have some relations to Worms, Mist Valley and Genex monsters as well, judging by the card lore of both "Ally Mind" and "Ally of Justice Clausolas", the similarities between Ally of Justice Clausolas and Mist Bird Clausolas, the artwork on "Mist Valley Thunder Lord", and the sub-archetype Genex Ally.

This archetype is rather unique among all others. Most Archetypes tend to not focus exclusively upon destroying one particular category of opposing monsters. Indeed, against most Decks many of the cards in this Archetype will be useless. Fortunately, "DNA Transplant" can be used to set all opposing monsters to LIGHT to benefit from their effects while protecting it with "Imperial Custom".

"Allies of Justice" counter the "Worm" archetype very well, as the "Worms" are all LIGHT monsters with flip effects. Allies of Justice are designed to destroy LIGHT monsters, and can also counter flip effects.

Even though they can be used to counter "Cyber Dragon" Decks, they could also help out in one because most of them have effects that limit the usefulness of LIGHT monsters (such as "The Creator" or the Lightsworns) and since they're all Machines, they can be used as extra material for the "Chimeratech" monsters. You could also use "Black Salvo" to bring back monsters for a Synchro Summon.

An interesting thing to note about this archetype's name is that "Ally of Justice" usually would make people think that they are LIGHT monsters since "Justice" is usually associated with "goodness/good side" which is, in turn, usually associated with LIGHT, therefore an "Ally" (friend/team mate) of "Justice" would be on the good/LIGHT side as well. But in reality, they are DARK and have effects that destroy LIGHT monsters instead. However, their abilities might be a reference to The Light of Destruction. From another viewpoint the Ally of Justice name may reference the idea that when light cannot defeat itself, it must rely on darkness to aid it. It may also be a reference to the fact that Yugi Muto used mostly EARTH and DARK-Type monster cards (in addition to the fact that Seto Kaiba's signature card, Blue-Eyes White Dragon, is LIGHT Attribute). Also, since the "Worm" archetype is primarily LIGHT, "Ally of Justice" monsters may have been invented to defeat them, thus another reason to reference Justice if they are invaders. This is also reinforced by the card "Ally Mind" which mentions the Worm Nebula as well.

The "Ally of Justice" monsters might have a connection to "Elemental HERO" cards in that pictured on the "Worm" monster "Worm Zero" you can see what looks like "Skyscraper 2 - Hero City" under attack. It is possible that the Hero monsters might have had a hand in the creation of the Ally of Justice monsters in order to handle the threat that the Worms pose. However, due to the card lore of "Ally of Justice Clausolas" and effect of "Flamvell Magician", it would seem more likely that they were built by "Flamvells" in "Mist Valley". This is further reinforced by the card artwork of "Mist Valley Thunder Lord".

"Ally of Justice Thunder Armor" gives this archetype the ability to work against most monsters as it gives all "Ally of Justice" monsters piercing.

In the anime the Ghost army, Diablo, uses this archetype.

Dark Justice
This deck is easy to get used to even without Light type monsters on the opponent's side of the field. It works pretty well if you know what you're doing.

Cosmic Gateway OTK
The way that this Deck works is to have at least two LIGHT monsters on your opponent's side of the field. In order to fulfill that requirement there are two methods that you can utilize" one is the "Ojama Trio" method and the other is the "DNA Transplant" method. Using either method requires you to stall for some time so you should use cards like "Waboku" or "Swords of Revealing Light". Once your opponent has at least two LIGHT monsters on the field you can Special Summon three "Ally of Justice Cosmic Gateway" to the field and use "Limiter Removal" to double the ATK power of "Ally of Justice Cosmic Gateway". If you use the "Ojama Trio" method, be prepared to have "Final Attack Orders" on the field to force the Ojama Tokens into Attack Position. Use any cards to wipe out the opponent's defenses if you have chosen the "DNA Transplant" method. The "Ojama Trio" method will inflict 15,300 total. ((2,400x2)x3)+(3x300)=15,300

Unfortunately this OTK can be hard to pull off since it requires five or six cards to use. "Swords of Revealing Light" or "Limiter Removal" can be activated or Set a turn or two before, and "Waboku" or "Final Attack Orders" would have to have been set the turn before, but this strategy still requires three copies of "Ally of Justice Cosmic Gateway" as well as the "Ojama Trio. In addition to that, "Limiter Removal" is limited and you need to draw three copies of "Cosmic Gateway".

Other Tips
If using "DNA Transplant" you can use other cards in your Deck. "Lyna the Light Charmer" can help you take over your opponent's monsters (if the Attribute 'LIGHT' is selected with "DNA Transplant"). Also, since all monsters on your field are LIGHT, you can use them to Synchro Summon "Light End Dragon" to your side of the field.

When "DNA Transplant" isn't on the field all your Ally of Justice monsters will be DARK and as a result you can Synchro Summon "Dark End Dragon" to your side of the field. With "Slip of Fortune" in your Deck you can keep your "Dark End Dragon" or your "Light End Dragon" safe from battle. Also, when they return to the field by the effect of "Slip of Fortune" their ATK points will return to normal.

"Allure of Darkness" is also handy in this Deck even with "DNA Transplant" on the field because Ally of Justice monsters are still DARK-Attribute when in your hand.

Weakness
Although Ally of Justice are strong when battling LIGHT monsters they can be countered with cards like "Skill Drain", "Destiny Hero - Plasma" and "Angel O7" (even though "Angel 07" is a LIGHT monster he negates any effects on the field). To counter those cards use cards like "Royal Decree" and "Lightning Vortex". "Blackwings" are also a threat since they have effects to counter the Ally of Justice and weaken them and are all DARK monsters (except for "Blackwing - Aurora the Northern Lights" which is a LIGHT monster). This means that the effect of "Ally of Justice Catastor" (the most versatile Ally of Justice monster) won't activate. In addition to that, they swarm the field quickly making hard to counter them. "Acid Rain", "Magnetic Mosquito" and "System Down" also hurt the deck because they clear the field of all Machine-Type monsters on the field (especially "System Down" because it removes them from play).

Trivia

 * In Yu-Gi-Oh! 5D's World Championship 2009: Stardust Accelerator, the German name of this archetype is "Tal der Gerechtigkeit" ("Tal" actually means "Valley", the creators of the game just took the word "Valley" instead of "Ally".)
 * Even though the monsters are supposed to be Allies of Justice, they are DARK Attributed, a quality normal associated with evil creatures.