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The Darkrai Holo #105 card in this set has been highly sought after due to its rarity and thematic connection to Halloween

Since this effect fulfills a similar role to a common piece of interaction that Lab already homes, Daruma Cannon, you can use Silvera in a lot of the similar spots you would otherwise Daruma and save your Cannon for further in the turn if your opponent really pushes that far, making for a nice perk in terms of resource management

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But it is still a handy source of mill which also has great impact defensively and as an enabler of certain other combos