Flip a coin. If heads, the Defending Pokémon is now Asleep.
20+Psychic
This attack does 20 damage plus 10 more damage for each Energy card attached to the Defending Pokémon.
How much is Mewtwo #20/165 worth?
Mewtwo #20/165 is a Rare Holo card from Expedition Base Set (2002) — today it trades at roughly $479.53 ungraded. Across the 2 printings we track, copies run anywhere from $350.00 to $1,499.99 depending on the version you're holding.
Grading changes the math on this one: a PSA 10 is valued around $67,500.00, roughly 140.8x the raw price, while a PSA 9 sits near $5,500.00. 1,646 copies have been graded to date, and 4% of them came back a 10 — worth knowing before you pay grading fees.
We update this valuation every night from live market data and verify it against real completed sales — see the chart above for how Mewtwo has moved over time.