Forum:Why are the following cards Banned?

There are certain cards that are banned during the timeline of the Yu-Gi-Oh! metagame, but there are some cards that I do not actually understand the reason behind its prohibition. Some of these cards are banned from the past, so if you were present at that game in the past, can you tell me the reason behind it?

Anyway, these are some of the cards that I would like some clarification on its prohibition:

(If the month and year is mentioned it means it's only banned in the past so far, and thus needs a reason on why it's banned at that time)
 * Dark Magician of Chaos
 * Dimension Fusion
 * Last Will
 * Magician of Faith
 * Makyura the Destructor
 * Metamorphosis
 * Ring of Destruction
 * Victory Dragon
 * Time Seal
 * Sangan (Sept '04)
 * United We Stand (Sept '04)
 * Mirror Force (Sept '04 & Sept '05)
 * Chaos Sorcerer (Sept '06 to February '09)
 * Breaker the Magical Warrior (March '07 & March '08)

Thank you for your wisdom if you can reasonably explain the greater purpose of the ban. 115.134.4.85 16:32, March 1, 2010 (UTC)