seto kaiba yugioh deck starter Yu-Gi-Oh! Kaiba 1st Edition Structure Deck ( Yugioh) Yugioh Structure Deck Yugi Muto

Or are aware of pages to put into the binder that fits jumbo cards

C Common Command Knight X FIRE Level 4 [ WarriorEffect ] ATK 1200 DEF 1900 All Warrior monsters you control gain 400 ATK

So any upgrades basically based on marrying both the dragons effect (thats sounds...wrong) but of course with the a balance but powerful personal touch (With some agenda to make gemini pool better) which, unless its its OP then its pretty much "why not?" Double attack of Cthonian is upgraded by using Yata-Lock as inspiration to become phase doubling to emulate the repeated turns that occure on that lock (of course the fair version of it) while also emulate "attacking twice" via double battle phase

You can also look at successful desk lists online