SWSH12: Silver Tempest Serperior VSTAR #8: PSA 9 vs PSA 10

On SWSH12: Silver Tempest Serperior VSTAR #8, the PSA 10 premium is a wide gem-mint premium: PSA 10 sells for 3.9x a PSA 9, a $44 delta. Based on the most recent PSA 10 sale of $60.00 on Apr 7, 2026, the math leans toward holding the 9: expected value turns negative at conservative upgrade probabilities once the resub fee is in.

SWSH12: Silver Tempest Serperior VSTAR #8 Holo

PSA 10

$60.00

Last sale $60.00 on Apr 7, 2026 UTC

PSA 9

$15.52

Last sale $17.10 on Mar 30, 2026 UTC

PSA 8

$6.39

Last sale $4.25 on Jul 2, 2025 UTC

The Spread

The PSA 9 to PSA 10 spread on Serperior VSTAR #8 SWSH12: Silver Tempest.

$44

Dollar gap, PSA 9 to PSA 10

3.9x

PSA 10 sells for 3.9x a PSA 9

Three-Outcome EV Calculator

PSA 9 acquisition cost ($)

PSA resub cost ($)

Probability of each outcome (must total 100%)

PSA 10 (upgrade) 15%

PSA 9 (regrade) 70%

PSA 8 (downgrade) 15%

Defaults are conservative starting points. Adjust based on the specific slab. A borderline 9 with strong centering plays differently than a 9 with edge wear.

PSA 10 outcome (sale price minus resub minus acquisition) $0

PSA 9 outcome (regrade, no upgrade) $0

PSA 8 outcome (downgrade, slower sell, tied capital) $0

Expected Value

Math favors holding the 9

SWSH12: Silver Tempest #8 Serperior VSTAR Holo released in 2022 sits in the vintage WOTC tier where gem-mint premiums above $44 are common. PSA 10 populations shrink faster than supply on cards of this era, which is why the upgrade arbitrage stays alive.

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