"If you have yugioh cards you might have noticed in the bottom left corner there is a bunch of numbers. If the cards are not japanese edition then you can enter the numbers as a password in the password place on the game and you will get the card that has that password so you can actually use your real deck. here are some of my favorite codes.
Harpie's feather duster 1814450
Gobline's secret remedy 11868825
Toll 82003859
Nimble momonga 22567609
Horn of the unicorn 64048146
Fairy Meteor crush 97687912
Megamorph 22046459
Ookazi 19523799
Gravekeeper's servant 16762927
Dream clown 13215230
Giant rat 67017120
Masked sorcerer 10189126
The next two cards make an awesome combo that make it so your opponent can't attack. just activate both of theme and set DNA surgery to insect.
DNA surgery 74701381
Insect barrier 23615409" - Adam

"my deck has this
cuopop9999a 9999d
guesdivxf8a1" - yeti

"gives you Blue eyes white dragons
89631193 and 80906030" - Elo