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I'd be tempted to pick up copies of the ones that are still cheap just in case, especially one with unique effects like Worldwalker Helm and Esoteric Duplicator

Also, if you are a very inexperienced collector, you may want to make sure that someone isn't selling you a proxy instead of a real card

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Yes, a Brainstorm is wildly better than draw a card and lose a life but you are using them in much the same way and in much the same situations

Alternative: Just Proxy It If you are not a serious collector with a ton of $$ or trying to use it for tournament play, maybe you could just buy a nice proxy instead