Unown S (Secret Wonders 39/132), Rare, Basic, 50 HP. Illustrated by Kazuyuki Kano. Prices are estimates from TCGPlayer and Cardmarket, not guaranteed values.
Shaped like ancient writing, it is a huge mystery whether language or UNOWN came first.
Card text
Poke-POWER: SET — Once during your turn (before your attack), if you have Unown S, Unown E, and Unown T on your Bench, you may flip a coin. If heads, search your discard pile for an Energy card, show it your opponent, and put it on top of your deck.
Hidden Power 10 — Flip a coin. If heads, the Defending Pokémon is now Confused.
Questions
Is Unown S 39/132 rare?
It is a Rare from Secret Wonders, a 132-card set.
Is Unown S 39/132 tournament legal?
Unown S 39/132 has rotated out of the current formats.