People saying to keep the other generations out, what they don't know that is completely irrelevant because half of the cards that's in the current game was featured in yugioh GX!
Elemental Heroes are going to break the game. everything else besides the original YuGiOh is dumb and unbalanced. Don't know anything about other gens but i can tell you for sure they are dumb and unbalanced.
Toons were in the original series so I don't really get how they can possibly be broken? Unlike that new stupid Elemental Hero garbage. Elemental Heroes are newer so they're definitely going to be broken when they bring them into the game. I don't even know any Elemental Hero cards but they are definitely going to 🔥 up the meta when released.
By your logic Pre-Errata Chaos Emperor Dragon, Magicial Scientist, Pot of Greed, and Painful Choice are not broken since they are older cards but Smile World, Hieratic Seal of the Dragon King, and Broken Bamboo Sword are broken because they are newer cards. I don't think you know how card balance works
Pot of Greed was in the original YuGiOh series if you forgot. Don't really get how it's a broken card? It's decent but it's not as new as some of the other cards in the game so I don't really see how it's unbalanced?
Pot of Greed is broken because it's a costless +1 that is an automatic audition to any deck and will make games even more luck based, as the player getting PoG first will get more advantage.
Also you're extremely dumb. Stuff like Knight of the Red Lotus and Heavy Knight of the Flame is way later from the original generation; cards are broken in a case by case basis, not by their release date
Seriously you have no knowledge about yugioh, pot of greed is broken cuz it's the best card in every flim situation, you always get one more extra card for free which could potentially setup threatening combos.