from the new update patch that
Altony gives, there's a new menu called "Virtual Battle" which basically let you copy the other people deck.
how? you just need to have the ID copy of that deck.
go to your Deck edit -> choose 1 deck -> edit -> List -> ID Copy
here's an example
1,2,2,2,3,3,3,4,4,4,40001,40001,40005,40007,40008,40015,50004,6,9,9,
that's just an ID copy from the initial deck btw and yeah there's that 1 trailing comma not because i accidently add it.
now goes to a bit of rant from me, while the current deck edit view is better for eyes, i like the old version just because i can filter out monster, magic, and trap.
edit : nvm, you can still search monster, magic or trap. the green circle symbol is magic, and red circle is trap.