The highest I know of is 5000 with 5 Headed Dragon and one of my favorite cards Dragon Master Knight along with 5000
Armityle the Chaos Phantom has 10,000 ATK during your turn only.
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Number 32: Shark Drake, 2800.
Yes you can if you use the card "double attack."
The highest base DEF is 5000.
Dragon Master Knight and Five-Headed Dragon both have the highest Original ATK of 5000. posted by daniel cameron
Tyler The Great Warrior