Dark Magician Cosmo Brain: deck recipe

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Cosmo Brain is an interesting addition to the game, its effect gives many high Level Normal monsters a way to be Special Summoned directly from the Deck.

This deck focuses on Special Summoning Dark Magician from the hand, Deck or Graveyard, using Cosmo Brain, Ancient Rules, Dark Magic Curtain and Birthright, and then takes advantage of the various support cards we have in the game for the iconic Level 7 Spellcaster to get rid of the opponent’s backrow and/or monsters.

Example Deck

Legion the Fiend JesterLegion the Fiend JesterLegion the Fiend JesterMagician's RodMagician's RodCosmo Brain
Cosmo BrainDark MagicianDark MagicianDark MagicianDark Magic CurtainDark Magic Attack
Dark Magic AttackIllusion MagicAncient RulesAncient RulesAncient RulesBirthright

Set Skill

[Skill] descriptionUser
Master of Magicians
Can be used after your LP decrease by 2000. Randomly add Thousand Knives, Dark Magic Attack, and Dark Magic Expanded to your hand. This skill can only be used once per duel.

How to Use

Legion the Fiend Jester & Illusion Magic

Once per turn, if Legion the Fiend Jester is sent from the field to the Graveyard, you can add a copy of Dark Magician from your Deck or Graveyard to the hand; you can Summon this monster and wait for your opponent to destroy it or you could Tribute it to activate Illusion Magic’s effect, essentially adding three copies of the Level 7 Normal Monster to your hand.

Once you have Dark Magician in your hand, you can Special Summon it with Ancient Rules, which is now available at three copies, or you could discard it to Special Summon Cosmo Brain.

Cosmo Brain

You can Special Summon Cosmo Brain by sending a Dark Magician from your hand or face-up on the field to the Graveyard, Cosmo Brain then gains ATK equals to the Level of the monster you sent x200, which means that, in this case, it will reach 2900 ATK, which is quite respectable.

Once per turn, Cosmo Brain allows you to Tribute an Effect Monster to Special Summon a Normal Monster from your hand or Deck; you can Tribute Legion the Fiend Jester to trigger its effect and add a copy of Dark Magician to your hand or you could just Tribute Cosmo Brain itself and Special Summon a Dark Magician from the Deck.

Magician’s Rod

When Magician’s Rod is Normal Summoned, you can add a Spell/Trap that lists “Dark Magician” in its text from your Deck to the hand; essentially this card can search Dark Magic Curtain, Dark Magic Attack, Illusion Magic and Thousand Knives, if you decide to run it.

Once per turn, if you activate a Spell/Trap Card or effect, you can add Magician’s Rod from the Graveyard back to the hand by tributing a Spellcaster monster; ideally you want to Tribute Legion the Fiend Jester with this effect.

Dark Magic Curtain

Dark Magic Curtain allows you to Special Summon a Dark Magician directly from the Deck by paying half your Life Points and it also brings you range for Master of Magicians right away; keep in mind that you can’t Summon other monsters the turn you activate this card, you can only Set a monster, so you can’t search Dark Magic Curtain with Magician’s Rod and then activate it.

Dark Magic Attack

With the addition of Cosmo Brain, having a Dark Magician on the field is even less difficult, so activating this Spell Card and destroying all Spell & Trap Cards your opponent controls is fairly easy; Dark Magic Attack is very effective against decks like Amazoness that like to hide behind their backrow and it’s pretty much necessary seeing how popular this deck has become.


After you have sent Dark Magician to the Graveyard to Special Summon Cosmo Brain or the monster has been simply destroyed by a Treacherous Trap Hole, you can Special Summon it with Birthright; this Continuous Trap can be used to prevent early OTKs.

Additional Notes


[Skill] descriptionUser
Master of Magicians
Can be used after your LP decrease by 2000. Randomly add Thousand Knives, Dark Magic Attack, and Dark Magic Expanded to your hand. This skill can only be used once per duel.

This deck doesn’t run cards like Cosmic Cyclone, so activating this Skill is not exactly easy; Thousand Knives and Dark Magic Attack are both pretty good cards, especially since they are added to the hand from outside the Deck, and Dark Magic Expanded has also synergy with Cosmo Brain, the other high Level Spellcaster of the deck.


  • Compared to the one that features Silent Magician, this version is more consistent, but it does lack that “once per turn” protection the Level 4 Spellcaster can provide and its ability to float into a 3500 ATK monster after being destroyed; on the bright side, the recent further rise in popularity Amazoness decks have seen has definitely made Silent Magician less viable.

  • This deck is weak against cards like Paleozoic Canadia, Floodgate Trap Hole and Treacherous Trap Hole, all still very popular in the current meta.

  • Going first generally puts this deck, like many others, at a disadvantage, Sphere Kuriboh, Paleozoic Canadia and Treacherous Trap Hole are all cards that can be considered to solve this issue.


Grifford 17days ago
Good idea, but Blue eyes is still stronger. If you want to play dark magician you'll need to play it with Silent Magician and then yeah... it becomes op.
Anonymous 21days ago
Any idea to replace "legend of the fiend jester"? I own every card except this one
<< Anonymous(Anonymous )
Anonymous 21days ago Reply
Blue Dragon summoner. If I remember his name correctly @@"
Anonymous 26days ago
The blue eyes version is much stronger
<< Anonymous
Royce_Morgan 25days ago Reply
Very much true. I think it can be said that the Dark Magician Cosmos Deck is the budget version of the Blue Eyes. You still need to buy 2 White Dragon of Legends, but don't need to go looking through Stardust Accelerator
Kevinz_ 27days ago
interested in trying it!
Anonymous 31days ago
Worth getting
Anonymous 31days ago
I want a matchup section like in the cosmos brain original build D:
Too bad you don't get two copies of Cosmo Brain with the Structure Deck
<< Anonymous
Anonymous Reply
Paying for a second is worth it though with all the extra cards you get.
<< Anonymous
Anonymous Reply
Get 1 Cosmo Brain from deck for 1k gems, use dream UR ticket to get Silent Magician EX exclusive. Run a mix that uses both Cosmo Brain and Silent Magician to compensate for not having 2x of either. Done, problem solved. Don't have dream UR ticket? Start a new account and build deck there.
muy mala nah :v

Commens and feedback




Comments (updated every hour)

this deck needs Legionnaire to make it truly competitive or Ravine
Lol, you are the one that got it reversed. XYZ is the monster and xyz is the summoning mechanic.
The only cancer in this event is yubel mill deck
For me its better that there is tier 3 and KOG worthy. Because the KOG worthy are those tier 4 or...
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