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In Legacy and Vintage, this MTG card stops game-winning combos when you have no mana open

While Reserved List cards are especially likely to be bought out (which is the most common cause of a price spike) thanks to their low supply and the Reserved List itselfwhich offers a wall of protection around speculators, who don't have to worry about a surprise reprint ruining their investmentolder, low-supply Modern, and Commander cards deal with the same issue, just on a smaller scale

There are also some specific cards that often factor into this

Bastion Protector sneaks in as the only creature reprint among these 4 precons, which seems flavorful and offers a buff and solid protection to your commander