As of 2021, here is a list of cards that were banned in the Legacy format:

    Advantageous Proclamation
    Amulet of Quoz
    Ancestral Recall
    Backup Plan
    Balance
    Bazaar of Baghdad
    Black Lotus
    Brago's Favor
    Bronze Tablet
    Channel
    Chaos Orb
    Contract from Below
    Darkpact
    Demonic Attorney
    Demonic Consultation
    Demonic Tutor
    Double Stroke
    Earthcraft
    Falling Star
    Fastbond
    Flash
    Frantic Search
    Goblin Recruiter
    Gush
    Hermit Druid
    Imperial Seal
    Immediate Action
    Jeweled Bird
    Library of Alexandria
    Mana Crypt
    Mana Drain
    Mana Vault
    Memory Jar
    Mental Misstep
    Mind Twist
    Mind's Desire
    Mox Emerald
    Mox Jet
    Mox Pearl
    Mox Ruby
    Mox Sapphire
    Mystical Tutor
    Necropotence
    Oath of Druids
    Power Play
    Rebirth
    Secret Summoning
    Sentinel Dispatch
    Shahrazad
    Skullclamp
    Sol Ring
    Strip Mine
    Survival of the Fittest
    Tempest Efreet
    Time Spiral
    Time Walk
    Timetwister
    Tinker
    Tolarian Academy
    Vampiric Tutor
    Wheel of Fortune
    Windfall
    Worldknit
    Yawgmoth's Bargain
    Yawgmoth's Will

Magic: The Gathering is a complex game with thousands of unique cards, each with its own abilities and interactions. Some cards are banned in certain formats for various reasons. Here are some of the most common reasons:

    Power Level: Some cards are simply too powerful and can create game states that are extremely difficult for the opponent to overcome. For instance, the "Power Nine" (which includes cards like Black Lotus and the five Moxen) are infamous for their incredibly high power level.

    Game Balance: Cards might be banned because they significantly warp the game around themselves. When a card is so powerful or efficient that it becomes the cornerstone of the majority of successful decks, it reduces diversity in the game and can make gameplay repetitive and less enjoyable.

    Fast Mana: Cards that generate a lot of mana quickly, like Black Lotus or the Moxen, enable players to cast powerful spells much earlier than usual, often leading to quick and uninteractive games.

    Uninteractive Gameplay: Some cards can lead to game states where the opponent has very few meaningful decisions. This includes cards that lock out the opponent from playing spells, rapidly deplete the opponent's resources, or assemble a game-winning combination very quickly.

    Tournament Play Duration: Some cards can lead to excessively long games, or even infinite loops, which are impractical in a tournament setting.

    Card Availability: In some cases, cards might be banned because they are hard to obtain and would create a barrier to entry for the format.

    Ante Mechanic: There are cards that were designed for the "ante" mechanic, where the winner of the game takes possession of a card from the loser. This mechanic is generally considered to be gambling and is not used in tournament play, so cards referring to it are banned.

Remember, the goal of the game's designers when banning cards is usually to create a diverse, balanced, and enjoyable gameplay environment. This process involves continuous adjustments and close attention to player feedback and tournament results.
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