"/Assault Mode", known as "/Buster" (
This archetype was localized to "/Assault Mode" in order to convey a greater sense of power, according to Dan Scheidegger (an Upper Deck Entertainment employee) in a post on Pojo.
"/Assault Mode" versions have the same name as its counterpart, but with "/Assault Mode" at the end. They have 500 more ATK and DEF, two more Levels and a more powerful version of the Synchro Monster's effect (ex. "Stardust Dragon/Assault Mode" can be Tributed whenever a Spell/Trap/Monster effect is activated whereas "Stardust Dragon" can only be Tributed to negate a Spell/Trap/Monster effect that would destroy a card on the field). When the "/Assault Mode" monster is destroyed, the regular version may be revived.
|Arcanite Magician/Assault Mode||Arcanite Magician||Destroy all cards your opponent controls by removing 2 Spell Counters from this card|
|Colossal Fighter/Assault Mode||Colossal Fighter||Decrease the ATK of your opponent's monsters by 100 for each Warrior monster in your Graveyard|
|Doomkaiser Dragon/Assault Mode||Doomkaiser Dragon||Special Summon as many Zombie monsters from either player's Graveyard(s) to your side of the field when this card is Special Summoned|
|Hyper Psychic Blaster/Assault Mode||Hyper Psychic Blaster||If this card destroys a monster in battle, inflict damage to your opponent equal to its DEF and gain LP equal to its ATK|
|Red Dragon Archfiend/Assault Mode||Red Dragon Archfiend||Destroy all other monsters on the field after damage calculation when this card declared an attack|
|Stardust Dragon/Assault Mode||Stardust Dragon||Negate the activation of a Spell, Trap, or Monster Card's effect and destroy it by Tributing this card|
|T.G. Halberd Cannon/Assault Mode||T.G. Halberd Cannon||Negate the Summon of an opponent's monster(s), and banish those monster(s) and all Special Summoned monsters the opponent controls.|
Jack Summoned "Red Dragon Archfiend/Assault Mode" first and began to boast about it but Yusei quickly brought out "Stardust Dragon/Assault Mode". A lot of the Duel consisted of both players using various cards to protect their dragon and take out their opponent's. Eventually, both "/Assault Modes" were destroyed and the regular "Red Dragon Archfiend" and "Stardust Dragon" returned. Yusei increased "Stardust Dragon'" ATK so it could defeat "Red Dragon Archfiend" and used "Synchro Destructor" to take out Jack's remaining Life Points.
"Stardust Dragon/Assault Mode" appears as a character in Yu-Gi-Oh! 5D's World Championship 2009: Stardust Accelerator, in Yu-Gi-Oh! 5D's World Championship 2010: Reverse of Arcadia, and in Yu-Gi-Oh! 5D's World Championship 2011: Over the Nexus, and "Red Dragon Archfiend/Assault Mode" appears in Yu-Gi-Oh! 5D's World Championship 2009: Stardust Accelerator.
"/Assault Mode" monsters are extremely powerful, but in order to be used effectively their user must have very good control over their own deck and be able to summon the desired Synchro Monster with ease. A deck that is too dedicated to supporting "Assault Mode Activate" may not support the Synchro Monster properly enough to be able to summon it quickly. On occasion, an "/Assault Mode" monster's effect may not be as desirable as the original ("Hyper Psychic Blaster/Assault Mode" does less damage with its effect, generally, than its original version's piercing damage, and "Red Dragon Archfiend/Assault Mode" has a severe drawback).
A way to deal massive damage to your opponent's life points is to have your Synchro Monster of choice on the field. "Hyper Psychic Blaster" will deal the most damage but "Stardust Dragon" has the greatest chance of working. Attack with the Synchro Monster, then use "Assault Mode Activate". You can also chain "Assault Mode Activate" to avoid the loss of your monster and maintain field advantage. Then, attack with the "/Assault Mode" Monster. Activate "Assault Overload" and inflict damage to both players equal to the /Assault Mode Monsters' level X 200. Then attack with your original Synchro Monster and if your opponent has a clear field or you used "Hyper Psychic Blaster/Assault Mode" then you will win.
Cards that can negate "Assault Mode Activate" are very effective against this deck type because you still lose your Synchro Monster.
The deck that "Doomkaiser Dragon" fits best into is one built around "Zombie World", allowing you to Special Summon monsters from either player's graveyard. Possible uses for these monsters include tribute fodder, such as for "Beast King Barbaros" and the ability to easily activate its field-clearing effect; Synchro Summons, if you revive Tuner monsters; or fodder for anything that needs large amounts of monsters on the field.
"Arcanite Magician" and "Arcanite Magician/Assault Mode" are used in a Spell Counter Deck. "Magical Exemplar" makes Special Summoning much easier and saves time to Synchro Summon your key monster, "Arcanite Magician". "Instant Fusion" works very well with "Magical Exemplar" because you can use it to Special Summon a "Musician King" and use "Exemplar's" effect to Special Summon a "Night's End Sorcerer" from your hand or graveyard. "Arcane Apprentice" is a better choice because you get "Assault Mode Activate" to you hand after you Synchro Summon with it.
Use "Magical Citadel of Endymion" and remove spell counters from it so that your "Arcanite" or "Arcanite/Assault Mode" will not lose ATK when using their effects. Lastly, you can use "Miracle Synchro Fusion". Since /Assault Mode monsters are useless in the graveyard, you can fuse a used-up "Arcanite Magician/Assault Mode" with "Tempest Magician" or "Arcanite Magician" to make "Supreme Arcanite Magician". It's slower than either Arcanite but it is much more powerful and can allow you to draw cards.
A "Colossal Fighter/Assault Mode" Deck uses Warrior monsters to swarm the field and eventualy the Graveyard.
Use the field spell "Dragon Ravine" to send "Dragunity Phalanx" to Graveyard and search out "Dragunity Dux"; Normal Summon it and use it's effect to equip "Dragunity Phalanx"; Special Summon "Dragunity Phalanx" and Synchro Summon "Dragunity Knight - Vajrayana" because it can equip "Phalanx" again, letting you summon "Stardust Dragon".
This deck is based on tuning Level 4 non-Tuner Winged Beast monsters with Level 2 Dragon Tuner to summon "Dragunity Knight - Vajrayana". Special Summoning "Dragunity Arma Mystletainn" from hand can lead to summoning "Stardust Dragon". Strategy of this deck is simple and you just have to use "Dragon Ravine" as early as possible to spam Synchro Monsters and /Assault Mode Monsters.
Hyper Psychic Assault
This deck is quite possibly the easiest of the "/Assault Mode" decks to use due to the usability of "Overdrive Teleporter" and "Hyper Psychic Blaster" being a Level 9 Synchro Monster. Thus, Special Summoning "Hyper Psychic Blaster" is as simple as Tribute Summoning "Overdrive Teleporter", Special Summoning at least one "Psychic Commander" and tuning "Teleporter" and "Commander" to Synchro Summon "Blaster". From there, activate "Assault Mode Activate" as soon as possible.
A notable feature of "Hyper Psychic Blaster" is the summoning condition. Unlike other Level 9 Synchro Monsters, such as "Mist Wurm" and "Trishula, Dragon of the Ice Barrier", "Hyper Psychic Blaster" only needs 1 other monster (at minimum) to Synchro Summon it. Most of these decks take advantage of this valuable fact as much as possible.
Halberd Cannon Assault