SWSH12: Silver Tempest Skuntank V #108: PSA 9 vs PSA 10

The PSA 10 to PSA 9 spread on SWSH12: Silver Tempest Skuntank V #108 is a modest premium: $11, with PSA 10 copies trading at 1.7x a PSA 9. Based on the last tracked PSA 10 sale of $25.00 on Oct 6, 2025, the math leans toward holding the 9: expected value turns negative at conservative upgrade probabilities once the resub fee is in.

SWSH12: Silver Tempest Skuntank V #108 Holo

PSA 10

$25.00

Last sale $25.00 on Oct 6, 2025 UTC

PSA 9

$14.40

Last sale $14.40 on Jan 6, 2026 UTC

PSA 8

$9.50

Last sale $9.50 on Jul 11, 2024 UTC

The Spread

The PSA 9 to PSA 10 spread on Skuntank V #108 SWSH12: Silver Tempest.

$11

Dollar gap, PSA 9 to PSA 10

1.7x

PSA 10 sells for 1.7x 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 #108 Skuntank V Holo released in 2022 sits in the vintage WOTC tier where gem-mint premiums above $11 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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