Draw engine
A draw engine, is as the name suggests, a method that refers to the way that a Duelist may draw cards from his/her deck, to maintain Hand Advantage.
The some popular Draw Engines at present are:
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Destiny Draw Engine
The Destiny Engine functions by using "Destiny Draw" to discard Destiny Heroes whose effect(s) are more beneficial from being in the Graveyard, such as "Destiny Hero - Malicious" or "Destiny Hero - Dasher", but more notably "Destiny Hero - Disk Commander" to revive it later with "Premature Burial" or "Monster Reborn", or with "Destiny Hero - Fear Monger". "Elemental Hero Stratos" is commonly used to get the Destiny Hero you need, and so "Reinforcement of the Army" is used. This became quite a useful method of summoning the Monarchs, creating the so-called Perfect Circle Deck.
Destiny Draw is Limited as of the March 2010 Lists, severely hampering this engine's power.
Allure Draw Engine
This works by removing from play DARK monsters, such as "Dark Magician of Chaos", then reviving those monster(s) with either "Dimension Fusion", "Return from the Different Dimension" or more popularly, "Escape from the Dark Dimension". As of the March 2010 Lists it is Limited, severely hampering this draw engine.
Card of Safe Return Engine
Can be better known as CoSR Engine. This Draw Engine uses the effect of "Card of Safe Return" to get an extra Draw for each monster special summoned from the grave and get Hand Advantage. This engine is especially useful and really only good in Decks that can Special Summon many monsters from the Graveyard. Zombie Swarm and Dark World Decks are great decks to use with this Draw Engine.
A variation of this draw engine uses 2 "Manticore of Darkness" to continuously loop by sending 1 to the graveyard and sending the second one from your hand or deck to bring out the next one. The "Manticore Loop" is often used in Exodia OTK decks.
"Card of Safe Return" is currently Forbidden (September 2009 Lists).
Trade-In Draw Engine
Although this may not be a particularly popular draw engine, "Trade-In" has an advantage over other draw engines; it is not Limited or Semi-Limited. This draw engine discards powerful Level 8 Monster Cards to the Graveyard, usually to revive later. This can be useful in Zombies ("Despair from the Dark" or "Skull Flame" only, but "Vampire Genesis", "Kasha", "Doomkaiser Dragon/Assault Mode" and "Berserk Dragon" could also be used but they can't be revived), Destiny Heroes ("Dogma", "Plasma" and "Dreadmaster" are all Level 8), and Dragons (discard "Tyrant Dragon", "Dark Horus", or other powerful cards, and revive them with "Decoy Dragon" or "Red-Eyes Darkness Metal Dragon" in Dragon revival decks; use the discarded Dragons for "Dragon's Mirror" in Dragon Fusion decks to special summon "Blue-Eyes Ultimate Dragon" or "Five-Headed Dragon"). A deck which includes this card would also benefit from 3 "Ancient Rules" alongside 3 copies of "Blue-Eyes White Dragon", "Gogiga Gagagigo" or "Spiral Serpent" (all 2900+ Atk Normal 8 star monsters) to avoid tributing 2 monsters for a 8 star monster.
Recharge Engine
This draw engine is used in Lightsworns, but can be splashed into any deck that benefits from sending many cards to the graveyard. It consists of searching out Lightsworn monsters with "Charge of the Light Brigade" and then discarding them with "Solar Recharge". Doing those two things thins your deck by a total of 8 cards, sending 6 of them to the graveyard - a very fast maneuver, in short. The Recharge draw engine can be used in Lightsworns, of course; it is also commonly used in X-Sabers (which can retrieve the cards with "XX-Saber Ragigura", "XX-Saber Faultroll" and "Gottoms' Emergency Call", or set up a special summon of "XX-Saber Gardestrike") and even Zombies (which are famous for their ability to special summon from the graveyard). When this draw engine is used outside of Lightsworn, some of the two most common Lightsworns used are "Ryko, Lightsworn Hunter" and "Lyla, Lightsworn Sorceress". Unlike most other Lightsworns, their effects are non-specific to Lightsworns, and can give the ability to destroy spells and traps to decks that do not normally have it.
Dedicated Lightsworn decks also use the effect of "Garoth, Lightsworn Warrior" to draw many new cards. With its effect, you can thin your deck even more quickly than normal.
"Charge of the Light Brigade" is Limited by the March 2010 Lists, hampering this engine's severity - though not as severely as the Allure and Destiny Draw engines. As a replacement, you can use "Reinforcement of the Army" - though it is not as fast as Charge, and you will have to use Lightsworn monsters like "Jain, Lightsworn Paladin", it is still useful.
Reckless Greed Engine
Using 3 Reckless Greeds together lets you draw 6 cards and skip only 2 Draw Phases, since their drawbacks don't stack. Mask of Darkness, now at 3, can bring back your Reckless Greeds and allow you to draw even more. This engine is commonly used in decks that do not have ready access to any other. It can also be combined with other draw engines for very fast decks, as the drawback of not drawing during the draw phase is evened out by using other cards to get extra draws.
Appropriate Engine
Appropriate is a card that is used when your opponent draws cards outside of his/her draw phase. When your opponents does draw a card(s) from cards such as Destiny Draw, Solar Recharge, or other cards that speed up decks, you can draw 2 cards from your deck. This provides lots of draws and allows your deck to be easier to use, for it gives you lots of cards to use per turn. This card is sometimes used in Exodia decks, as it makes it easier for the player to draw all pieces easier. When combined with cards such as Hand Destruction and Card Destruction it allows the player using Appropriate to draw an extra 2 cards from what they draw from either of those cards.
One draw back to this card is that when it is activated, it Misses the timing but after activation, it does not. Also, after activation, the effect of Appropriate is NOT OPTIONAL, so the chance of decking out is higher, making it easier for you to lose a duel.
Putting 3 Appropriate in a deck can allow massive draws, but if there isn't a way for your opponent to draw, having Appropriate on the field is utterly pointless.
There are many cards that can be used with this card, such as Hand Destruction, Card Destruction, and Dark World Dealings but there are defensive cards that can be used as well, such as Dark Bribe to stop your opponents spells and traps, Level Modulation to bring back your most powerful Level Monsters such as Horus the Black Flame Dragon LV8 , and Book of Eclipse to put your opponents monsters Face-down to either stop their effects or to keep them from declaring an Attack. You can also use Mask of Darkness to bring back your Appropriates when they are destroyed from cards such as Heavy Storm or Mystical Space Typhoon. Strong Effect Monsters like Chainsaw Insect and Destiny Hero - Defender also combo well with Appropriate, since their penalty effects allow your opponent to draw, turning the penalty into an advantage.
There are monsters that also go well with this engine, such as Tragoedia and Muka Muka because their attack and defense strength depend on how many cards are in your hand.
Heart of the Underdog Engine
Heart of the Underdog is a card that allows you to draw extra cards into your Draw Phase by drawing a Normal Monster. The advantage of this engine is when you run Normal Monsters at your Deck, your draw power shall be increased and you may yet draw constantly if you draw a lot of Normal Monsters during your Draw Phase, causing you to speed up your Deck sharply. This engine benefits from a Deck that does not use almost any Effect Monsters, but abuses Special Summon and searching effects like Emissary of the Afterlife and Enchanting Fitting Room. This engine is mostly used for Exodia decks, but also works pretty well at Ojama Decks.
Good Goblin Housekeeping Engine
Good Goblin Housekeeping is a card with a ruling that allows you to draw an extra card if, upon resolution, it is in the graveyard. So, combining this with cards such as Emergency Provisions, Twister, and Mystical Space Typhoon, one can add additional draw power, as well as provide additional benefits, during or outside of the draw. Coupled with cards like Rose Fairy, Watapon and Blackwing - Breeze the Zephyr and additional draw support, special summons can come quite easily for tribute fodder.
Card of Sacrifice Engine
Card of Sacrifice, much like Reckless Greed, is a card that allows you to draw two cards but with less of a negative effect. Decks that do not attack such as Burn Decks benefit as they suffer no drawbacks from this card. They can also be stacked to draw multiple cards in one turn since the drawbacks affect only this turn.
