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"'''The Agent'''" ({{Ruby|代|だい}}{{Ruby|行|こう}}{{Ruby|者|しゃ}} ''Daikōsha'') is an [[archetype]] consisting of [[LIGHT]] and [[DARK]] [[Fairy]]-[[Type]] [[Monster Card|monsters]]. They were introduced in ''[[Ancient Sanctuary]]'', and were reprinted in ''[[Dark Revelation Volume 2]]''. They made a return in the ''[[Lost Sanctuary Structure Deck]]''/''[[Structure Deck 20: Lost Sanctuary|Lost Sanctuary]]'' Structure Deck. After many years of inactivity, ''[[Duelist Alliance]]'' revitalized the archetype once again with the introduction of the only [[DARK]] "The Agent". The archetype is related to the [[Field Spell Card]] "[[The Sanctuary in the Sky]]". They are all named "The Agent of <property> - <planet>".

With the archetype's reintroduction in ''[[Lost Sanctuary Structure Deck]]''/''[[Structure Deck: Lost Sanctuary]]'', the archetype as a whole now focus on [[banish]]ing. For example, "[[The Agent of Miracles - Jupiter]]" can banish any "The Agent" monster in the [[Graveyard]] to increase a [[LIGHT]] [[Fairy]]-[[Type]] monster's [[ATK]] by 800. Also, when "[[The Sanctuary in the Sky]]" is on the field, Jupiter allows the player Special Summon 1 banished LIGHT Fairy-Type monster by discarding a Fairy-Type monster.

More importantly, "[[Master Hyperion]]" can be [[Special Summoned]] by banishing an "The Agent" from your [[hand]], field or Graveyard. Also, by banishing another LIGHT Fairy-Type monster, you can select and destroy any card on the field. If you have "The Sanctuary in the Sky" on the field the player may use this effect twice per turn.

"[[The Agent of Mystery - Earth]]" lets the player add any "The Agent" monster or "Master Hyperion" (if "The Sanctuary in the Sky" is on the field) to the hand from the Deck, and is a [[Tuner monster]] to boot.

Due to the [[March 2012 Lists]], "The Agent decks " Decks were severely weakened by the limiting of "[[The Agent of Mystery - Earth]]" and "[[T.G. Striker]], in the case of "[[T.G. ]]"–"The Agent " hybrid builds. However, the [[September 2012 Lists]] put "[[The Agent of Mystery - Earth]]" to [[Semi-Limited]] status, and the [[September 2013 Lists]] removed its limiting entirely, allowing "The Agent decks " Decks to return to the competitive scene.

A common strategy is to use "[[The Agent of Creation - Venus]]" to Special Summon 1-3 "[[Mystical Shine Ball]]s" by [[pay]]ing 500-1500 [[Life Points]] in order to set up the Graveyard for either the Summon of an "[[Archlord Kristya]]" or "[[Master Hyperion]]" as soon as the very next turn. "The Agent" Decks can also Summon strong monsters from the Extra Deck. If the opponent tries to avoid such a fate by not attacking the "Mystical Shine Balls", then they still run the risk of a Summoned "[[The Agent of Mystery - Earth]]" being Tuned into a Level 4, 5, 6, 7, 8, 9, or 11 [[Synchro Monster]], in addition to the [[Fairy]]-Type player gaining a free card with the effect of "Earth". The Summoned "Mystical Shine Balls" can also be used to summon Rank 2 [[Xyz Monster]]s such as "[[Gachi Gachi Gantetsu]]" and "[[Number 96: Dark Mist]]". "Earth", can search for any "The Agent" and or "Master Hyperion" (provided "[[The Sanctuary in the Sky]]" is on the field) when it is [[Normal Summon]]ed. "[[Genex Ally Birdman]]" can also be used for Synchro Summoning or Xyz Summoning a Rank 3 monster. "Hyperion" can also be used alongside "Earth" for Level 10 Synchro Summons, such as "[[Leo, the Keeper of the Sacred Tree]]". If there are two copies of "Hyperion", they can even be used for Rank 8 Xyz Summons, such as "[[Number 107: Galaxy-Eyes Tachyon Dragon]]", which can be deadly when used in conjunction with "Hyperion" and "[[Honest]]".

"[[The Agent of Force - Mars|Mars]]", "[[The Agent of Wisdom - Mercury|Mercury]]" and "[[The Agent of Judgment - Saturn|Saturn]]" seldom see play in a competitive-scene "The Agent " Deck. In fact, even the signature Fairy Field Spell Card "[[The Sanctuary in the Sky]]" is a rare card to see played. This is usually due to the rather weak effect of the Field Spell. however, it does allow the abilities of some key cards to activate, such as allowing "[[The Agent of Mystery - Earth]]" to search for "[[Master Hyperion]]", as well as the second use of the effect of said "[[Master Hyperion]]". Therefore, it is good to keep at least 1-2 copies, as it can also displace your opponent's Field Spells, such as "[[Necrovalley]]".

"The Agent" Decks, being almost fully comprised of [[LIGHT]] Fairy-Type monsters, nearly always utilize "Honest" and sometimes Main or Side Deck one or two copies of "[[Gozen Match]]" in order to counter non-single Attribute Decks in the format ([[Six Samurai]], Tengu Plant Synchro, "[[Gladiator Beast]]", "[[Wind-Up]]" and [[Dino Rabbit]]). Combined with their often Main Decked copies of the "[[Herald of Orange Light]]" this Deck certainly has competitive potential. Also, "The Agent " Decks can be recommended for budget players, since most necessary cards for the Deck are included in ''[[Lost Sanctuary Structure Deck]]''/''[[Structure Deck: Lost Sanctuary|Lost Sanctuary]]'', and other cards that make the Deck run smoothly, including "[[Archlord Kristya]]" and "[[Pot of Duality]]" are relatively inexpensive, making this Deck quite accessible to many players.

This deck uses numerous "[[Fairy]]" monsters to serve as the cost to summon "[[Herald of Perfection]]." With its 2800 DEF, "[[Herald of Perfection]]" can stall out the opponent for numerous turns, allowing time to draw key cards such as "[[Master Hyperion]]" and "[[Archlord Kristya]]." It will negate all effects, par [[Counter Trap Card]]s. It has a very strong control aspect, and can utilze "[[Royal Decree]]." to handle said Counter Traps and conserve resources. The card is very useful against Macro Rabbit, which "The Agent decks " Decks typically have a poor matchup against.

This Deck focuses on increasing the user's Life Points quickly to take advantage of effects of many monsters, including several monsters of "The AgentsAgent"monsters. The Deck is difficult for beginning players due to the the complex combos and understanding of different rulings needed. The Deck features two "Get rich quick" schemes and four monsters that benefit when you have higher Life Points than your opponent.

Despite the enormous potential and consistency that "The Agent decks " Decks can have, they are not without their weaknesses. "[[Archlord Kristya]]", a oft-played trump card in "The Agent decks " Decks themselves, can be as strong of a foe as it is an ally. Kristya's effect prevents an a "The Agent duelist " Duelist from summoning Summoning "[[Master Hyperion]]" and "[[Black Luster Soldier - Envoy of the Beginning]]", key cards to maintaining a foothold in the game. Due to the [[LIGHT]] monster emphasis, "[[Light-Imprisoning Mirror]]" and most [[Ally of Justice]] monsters can also prove dangerous for "The Agent decks" Decks. Most of the competitive "The Agent decks " Decks are also hybrids, i.e. ([[Chaos]], "[[T.G.]]", and [[Emergency Teleport|Tele-Agents]]), making "[[Gozen Match]]" another potential threat. [[Lightray]] and [[Lightsworn]] hybrid decks are spared this weakness, however.

[[Gravekeeper]]s also pose a distinct threat with "[[Necrovalley]]". Its effect of sealing the graveyard locks down most of the power plays an a "The Agent deck " Deck may have."[[Skill Drain]]", "[[Effect Veiler]]" and the opposing "[[Herald of Orange Light]]" are also grave issues, as the combos in most "The Agent decks " Decks are highly reliant on monster effects.

Perhaps the most effective cards to play against Agents "The Agent" cards are "[[Dimensional Fissure]]" and "[[Macro Cosmos]]", because they instantly close any Graveyard access for storing resources. They also render "[[Effect Veiler]]" and "[[Herald of Orange Light]]" useless, as their activation costs cannot be paid. For this reason, one should consider siding, if not maining multiple copies of "[[Mystical Space Typhoon]]," "[[Twister]]," and "[[Dust Tornado]]."