First off, there are a few things you need to know, you have to have a lower deck cost (DC) than your opponent to duel them and get thier rose card. Another thing to know is that going through the game you will encounter a few cards that are impossible to actually obtain, (EX: Riryoku) and others you may begin with but can only obtain other copies by custom dueling duel master K. You may not begin with any and/or every card, but you can gain wide varieties of cards, (not only 40), and no monster's attack nor defense value may exceed 9999 during any duel. Rex's stage goes like this:W W W W W W W
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To defeat him with low deck cost, i recomend zombies+call of the haunted/blue-eyed silver zombie+Pumpking/Zombie w/ 1100Atk or higher & Plant.
This strategy is to effectively power up all your monsters, i'd pick the patrician of darkness deck to use this strategy.
My little brother told me a nice strategy, use kaiser dragon with thunder dragon (Airknight parshath deck, or Luminous soldier deck) to make Twin headed Thunder Dragon(2800/2100).
This idea uses brute force over anything else, also since rex can get up to 3200, i would use several power ups or mirror wall.
An alternative strategy would be to manipulate the fact that rex has eternal rest, and make a machine deck from the robotic knight deck, hopefully rex doesn't use stain storm, because i forgot if he usually does or not, he rarely draws it.
The idea of this setup is to get out alot of strong machines, powered with machine conversion factories, then put cyber commander face up, in the defense position, and use limiter removals. Another strong tactic is to use rex's dinosaurs with your machines to make a very powerful monster when powered up, we might talk more about him in keith's tutorial page.
1- Anthrosaurus 2- Anthrosaurus 3- Armored Lizard 4- Bear Trap 5- Bracchio-raidus 6- Breath of Light 7- Crawling Dragon #2 8- Crawling Dragon #2 9- Eternal Rest 10- Grappler 11- Invigoration 12- Invigoration 13- Little D 14- Little D 15- Mammoth Graveyard 16- Megazowler 17- Megazowler 18- Pragtical 19- Pragtical 20- Raise Body Heat 21- Raise Body Heat 22- Raise Body Heat 23- Red Medicine 24- Sparks 25- Stain Storm 26- Sword Arm of Dragon 27- Sword Arm of Dragon 28- Tomozaurus 29- Tomozaurus 30- Trakadon 31- Trakadon 32- Trakadon 33- Two-Headed King Rex 34- Two-Headed King Rex 35- Two-Mouth Darkruler 36- Two-Mouth Darkruler 37- Uraby 38- Uraby 39- Uraby 40- Wasteland