Fiendish Duo is a 6-mana big creature with first strike that doubles the damage any of your sources would do to an opponent
Since its release, Pocket has drawn millions of players, generated staggering revenue, and sparked debate about its monetization design
If anything, it's shocking that Yugi would even consider letting any of the competition near his deck, let alone take it out in the wide open air of the sea right next to the side of a cruise ship
The ideal endboard with the best starters and no interuptions would probably look something like, Punk Jam Fever (xyz monster negate), Dragite (spell/trap negate), Juraishin (the new level 11 synchro that's raigekis on opponents turn), Ripper, and I:P/S:P, plus on top of that any hand traps would would've drawn into cause of the field spell