Here's why:
* Drawing two extra cards: This instantly gives the player a massive advantage in card advantage, allowing them to play more spells, traps, and monsters.
* No drawback: Unlike other draw cards, Pot of Greed has no cost or downside. It's purely a benefit, making it a highly desirable card to have in any deck.
* Unbalanced gameplay: The ability to consistently draw extra cards disrupts the balance of the game. It allows players to accelerate their strategies too quickly, making it difficult for opponents to keep up.
In essence, Pot of Greed allows players to dominate games by simply drawing more cards than their opponents, leading to an unbalanced and unfair playing field.
While some players might argue that Pot of Greed could be allowed with limitations (like limiting its use to once per duel), its inherent power makes it too risky for the game's overall balance.