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Example: Thoughtseize should be bad in Grixis Deaths Shadow against Abzan as the matchup is so grindy, but you need a way to stop Liliana of the Veil before it hits the battlefield and uses its -2 ability
Doubling Season Showcase In case you were questioning the usefulness of Doubling Season and how much players would want to get their hands on it, even the non-foil showcase made the list
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Though of course you can look up any rules or clarifications that you need online, having RulesDeck to hand stops any unnecessary fiddling with devices (and we all know that our FLGS doesnt always have the best Wi-Fi signal, right?), and allows you to have anything you need in a handy and accessible format