Herald

"Herald", known as "Declarer" in the Japanese and Korean version, are a series of LIGHT Fairy-Type monsters. The colored Heralds (which are all secondary colors) are Level 2 and have 300 ATK and 500 DEF, while "Herald of Perfection" is a Level 6 Ritual monster. The effect of each "Herald" focuses on negating a particular card effect (monster, Spell or Trap). In order to activate the colored Herald's effects, the monsters must be sent to the Graveyard from the hand, along with another Fairy-type monster. "Herald of Perfection" is the combination of all the Heralds' effects with a highly improved effect that can be activated by using a single Fairy-Type for its cost.

Playing Style
Heralds mainly focus on sending themselves and a Fairy-Type monster to the Graveyard to negate an activation of an opponent's spell, trap or monster effect. Herald of Perfection allows you to send only 1 Fairy-type monster to negate all types of activation except for a Counter Trap Card. A combination of "Archlord Kristya", "Herald of Perfection" and a "Royal Decree" can completely shut down any deck.

Perfect Herald
This variation of deck focuses on use "Dawn of the Herald" to tribute cards from your hand or field to the Graveyard to Ritual Summon "Herald of Perfection". After you have Ritual Summoned it, you can use the effect of "Dawn of the Herald" to return 1 monster from the Graveyard that you have tributed for the special summon to your hand or not to activate the effect so you can have exactly 4 Fairy-Type monsters in the Graveyard, allowing you to Special Summon "Archlord Kristya", that can prevent the opponent from Special Summoning. "Royal Decree" is used to prevent the activation of Counter Traps which Herald of Perfection can't negate and to save negations, whereas "Safe Zone" is an alternate option used to protect the Herald. The release of new Agents and "Master Hyperion" in Structure Deck 20: Lost Sanctuary greatly improved this deck.

Happy Herald
This Deck is similar to Perfect Herald but focuses on using "Advanced Ritual Art" to send Normal Fairy-Type monsters to the Graveyard; and in the process, Ritual Summoning "Herald of Perfection". These Normal Monsters are then retrieved and used with the effect of "Herald of Perfection". "Advanced Ritual Art" can also be used to send exactly 4 Fairy-Type monsters to the Graveyard, allowing you to Special Summon "Archlord Kristya".

Weaknesses
Cards that prevent Special Summoning will also keep Herald out of play, so "Vanity's Fiend" and "Vanity's Ruler" can shut down the Herald Duelist’s plans. Better yet, "Cursed Seal of the Forbidden Spell" can shut out Ritual Summons permanently. If you negate "Advanced Ritual Art" or "Dawn of the Herald" once, your opponent won’t be able to play them again. Cards that banish can also permanently shut down Herald of Perfection's effect.