Mystery Energy
The Best of XY · #166/171 · None · 2017JPN
Price history
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Graded values
Grades 1–6 are estimates modeled from the raw price — PSA/CGC/BGS 7–10 and Ungraded are live tracked market values.
PSA 10 chart is building — graded values are tracked nightly, a new point appears each day.
Graded population census · updated 2026-09-18
Population data from PriceCharting, updated monthly.
How much is Mystery Energy #166/171 worth?
As of October 1, 2026, Mystery Energy #166/171 from The Best of XY sells for around $3.75 in raw, ungraded condition.
Grading changes the math on this one: a PSA 10 is valued around $99.88, roughly 26.6x the raw price, while a PSA 9 sits near $12.78. 4 copies have been graded to date, and 75% of them came back a 10 — worth knowing before you pay grading fees.
Prices on this page refresh nightly from live TCGplayer market data and are cross-checked against actual sold prices, so a single inflated listing never becomes "the price". The chart above has the full history.
