A Beatdown Deck is a strong offensive Deck which concentrates on using high ATK-powered monsters to bring down the opponent's Life Points as quickly as possible. To have a successful Deck, players must be able to apply pressure to their opponent at the outset of the game before any real strategies can be employed. A common misstep in such a deck is to use powerful monsters simply for their power. A successful deck will include monsters that are not only powerful but have powerful effects to ensure the safety of monsters.
Very few safety cards should be included in Beatdown Decks. While a select few, such as "Magic Cylinder", may be used, Spell and Trap Cards should focus on clearing the opponent's field as quickly as possible (such as with "Mirror Force", "Torrential Tribute", and other staples) in order to provide for the full potential of the monsters. Monsters should also be Summoned to the Field as quickly as possible. A further possibility is to use Trap Monsters such as "Metal Reflect Slime". Trap Monsters help to swarm the field quickly, and can be used as tribute fodder. Cards that have a low Level but a high ATK also fit in well.
The most effective ATK stats for Beatdown Decks depend on the metagame, but generally are 1800 or higher for Level 4 or lower monsters, 2400 or higher for Level 5 and 6 monsters, and 2800 or higher for Level 7 or higher monsters.
Cards such as "Blue-Eyes White Dragon" and other powerful Normal Monsters should be left out as they contribute little to the overall function of the Deck. They should only be included if the Deck is a Level 4 Normal Monster Beatdown Deck, or based around one card, for example "Blue-Eyes White Dragon".
Any monster that requires more than one Tribute should try to be avoided unless they have a game-breaking effect (such as "Beast King Barbaros", who can be either a powerful 3000 ATK beatstick, clear the opponent's field, or be Summoned as a quick 1900 ATK beatstick).
Generally, don't expect most monsters to stay on the field for more than a few turns. Be aggressive and attack whenever possible. If one was to draw "Goblin Attack Force" before "Skill Drain", attack with "Goblin" and let it be destroyed when it switches to Defence Position. Waiting a turn or two to get "Drain" might cost a precious window of opportunity to attack the opponent's Life Points.
Cards that can target multiple cards for an attack such as "Chaos Ancient Gear Giant" are fantastic against decks based on swarming the field. The aforementioned card also has a very high attack and piercing damage, making it an overall amazing card for beatdown in general and OTKs.
"Evil HERO Malicious Edge" is a wonderful Level 7 monster to include due to his effect that it can be tribute summoned with one tribute when the opponent has a monster on their side of the field. It also inflicts piercing damage and can be searched with "Elemental HERO Stratos".
A great choice for a beatdown deck would be "Injection Fairy Lily". Its effect of gaining 3,000 ATK when attacking or attacked makes a death-machine against most monsters.
Alongside fast summoning, putting one "Gigantes" in a deck is usually very effective. A majority of the very good beatdown Monsters out there are EARTH-attribute. (ie: "Berserk Gorilla", "Goblin Attack Force" (or any variation thereof), "Chainsaw Insect", "Black Tyranno", etc...) so chances are quite high for there to be at least one EARTH Monster in the Graveyard before Special Summoning this Monster.
"Interplanetarypurplythorny Dragon" is usually effective in a Beatdown Deck as it has 2200 ATK and can be Special Summoned as soon as a monster is destroyed and sent to the Graveyard by battle or effect. Also, "Parry Knights" has 2300 ATK and can be Special Summoned when the player takes battle damage from an opponent's attack.
Cards that increase their ATK with certain effects like "Great Maju Garzett", whose ATK becomes double that of the monster Tributed for its Summon, gives access to a greater power to beat the opponent shortly. Other monsters that can increase their ATK include "Bazoo the Soul-Eater" and "Evilswarm Salamandra", whose ATK can hit 2500 and 2450 if it is possible to banish 3 and 2 monsters from the Graveyard, respectively, and their effects last until the end of the opponent's turn so it is possible to hopefully repeat without too much trouble.
"Thunder King Rai-Oh" is a near-compulsory addition to a Beatdown deck, not only because is it a level 4 monster with 1900 ATK, but it stops the opponent from searching and it can tribute itself to negate a Special Summon, which is very effective against most conventional decks.
"Honest" is a staple in most LIGHT Decks and is also very effective in LIGHT Beatdown Decks due to its ability to have a battling LIGHT monster gain ATK equal to the attack target's ATK until the end of the turn at the cost of sending "Honest" from the hand to the Graveyard.
An alternative is to use "Koa'ki Meiru" monsters. These tend to have at least 1900 ATK, and some have up to 2100 ATK for no Tributes. Their downside is that the player has to reveal a card in their hand but they also have powerful anti-meta effects.
"Inspector Boarder" is a 2000 ATK monster that effectively locks down most monster effects, considerably slowing the opponent.
"Eater of Millions" is a hard monster to get rid of that removes the opponent's best monsters and is a great way to use up Extra Deck cards that would otherwise go unused. With "Pot of Desires" it can turn into a considerable offensive threat.
"Dinowrestler Pankratops" is a 2600 ATK monster that can be Special Summoned if your opponent controls more monsters than you do, 500 more ATK than "Cyber Dragon".