Pokémon TCG: Astral Radiance Booster Bundle, 3 Booster Packs

Introduced in the Pokémon TCG: Sword & Shield—Astral Radiance expansion, Radiant Pokémon are powerful Basic Pokémon that come with a caveat: You can only play a single Radiant Pokémon in your deck. Powerful cards with similar requirements have been seen in the past: Ace Spec cards debuted in Black & White—Boundaries Crossed, and Prism Star cards were first seen in Sun & Moon—Ultra Prism. The exact constraints differ slightly from era to era, but the general principle is the same: these cards can provide a significant advantage when utilized well, so their use needs to be carefully controlled.