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The major reason a card will be banned in any TCG is to keep competitive play balanced by removing powerful and often game-breaking combos

Incapsula incident ID: 336000760017561780-41014820279948047

Lets take a look at Glacial Stalker as an example

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Company: Ultra Pro Brand: Magic The Gathering Series: Card Supplies Item Type: Card Sleeves Release Date: May 2010 UPC: 074427824532 Stock #: 356414 Our Guarantees to You, Our Valued Customer

With its number 107/105, it is one of the "Secret Rare" cards of the set, meaning it exceeds the official card count of the expansion