As long as your opponent has Kyogre, Kyogre ex, Groudon, or Groudon ex in play, Rayquaza ex's attacks do 40 damage to the Defending Pokémon (before applying Weakness and Resistance).
Attacks
20Dragon Bind
Flip a coin. If heads, the Defending Pokémon is now Paralyzed.
50Twister
Flip 2 coins. If both are tails, this attack does nothing. For each heads, discard an Energy attached to the Defending Pokémon.
How much is Rayquaza ex #39/40 worth?
Right now (November 8, 2026) the going rate for an ungraded Rayquaza ex #39/40 from Nintendo Black Star Promos is about $438.24.
Grading changes the math on this one: a PSA 10 is valued around $85,000.00, roughly 194.0x the raw price, while a PSA 9 sits near $6,766.00. 3,030 copies have been graded to date, and 2% 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 Rayquaza ex has moved over time.