Does 10 damage times the number of Energy cards attached to the Defending Pokémon.
Devolution Beam
Choose an evolved Pokémon (your own or your opponent's). Return the highest Stage Evolution card on that Pokémon to its player's hand. That Pokémon is no longer Asleep, Confused, Paralyzed, or Poisoned, or anything else that might be the result of an attack (just as if you had evolved it).
“So rare that it is still said to be a mirage by many experts. Only a few people have seen it worldwide.”
How much is Mew #8/53 worth?
Mew #8/53 is a Promo card from Wizards Black Star Promos (1999) — today it trades at roughly $9.07 ungraded.
Grading changes the math on this one: a PSA 10 is valued around $501.37, roughly 55.3x the raw price, while a PSA 9 sits near $28.96. 15,642 copies have been graded to date, and 22% 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 Mew has moved over time.