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Computer Error (Rocket's Secret Machine).

WoTC Promo · 16/53 · Promo
updated Aug 14, 2026
Computer Error (Rocket's Secret Machine) 16/53 from WoTC Promo
Raw market value · Normal
$6.84.
near mint, ungraded7 day +2.2% · 30 day +12.3%
Price by printing
Normalthis page$6.84
Check live eBay pricesPrices above are what copies actually sold for, not what sellers are asking.

Price history and graded value

monthly median sold price
$3.2$10$32$100SEP '21MAY '23DEC '24AUG '26

Grading odds

No population report for this card, so the prices below are the best case rather than the likely one.

✓ Worth grading
$150.00
top slab, best case

A PSA 10 sells for $150.00 against $6.31 raw plus a $25 fee. Without a population report we cannot weight that by the odds, so treat it as the best case: most submissions come back below the top grade.

More from WoTC Promo

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What moves the price of this card

The Computer Error (Rocket's Secret Machine) on this page is the Normal printing from WoTC Promo, and it trades at $6.84 in near mint condition. Only one printing of this card was produced, so there is no cheaper version to confuse it with.

Condition does most of the work below the surface. A copy with soft corners or a print line off centre trades well under the market price shown here, and a copy clean enough to grade trades well above it, which is why the PSA 10 sits at $150.00. Before you value your own copy, look at the corners under a light and check the centring on the back, where most cards give themselves away.