Do not use a proxy simply because the first listed price looks cheaper

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The card is also part of a limited series release, making it even more valuable
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DFCs in Innistrad had an as-fan of one, but also a guarantee of one, because the only way to open a DFC was from their dedicated slot
If this card is banished from your GY: You can make Special Summoned monsters your opponent currently controls lose 400 ATK for each Cyberse monster currently in your GY, until the end of this turn