Radiant Greninja was part of the Astral Radiance set, which included many Radiant versions, but only one Radiant Pokemon can be in a deck at once

Avatar: The Last Airbender (TLA) 394 cards Released 2025-11-21 $7,148.61 770.44 82.98 TIX Draft Cards Full-Art Appa Lands Full-Art Avatar's Journey Lands Borderless Scene Cards: Book 1 Borderless Scene Cards: Book 2 Borderless Scene Cards: Book 3 Borderless Field Notes Elemental Frame Cards Borderless Neon Ink Battle Pose Cards Borderless Battle Pose Cards Borderless Double-Faced Sagas Extended Art Cards Borderless Raised Foil Avatar Aang Buy-A-Box Promo Bundle Promo Draft Cards 286 cards Full-Art Appa Lands 5 cards Full-Art Avatar's Journey Lands 5 cards Borderless Scene Cards: Book 1 4 cards Borderless Scene Cards: Book 2 6 cards Borderless Scene Cards: Book 3 9 cards Borderless Field Notes 15 cards Elemental Frame Cards 18 cards Borderless Neon Ink Battle Pose Cards 4 cards Borderless Battle Pose Cards 5 cards Borderless Double-Faced Sagas 5 cards Extended Art Cards 29 cards Borderless Raised Foil Avatar Aang 1 card Buy-A-Box Promo 1 card Bundle Promo 1 card In the blink of an eye, they strode from deep snow to the end of this search

Then, if you're a collector or you're ok with spending way more money for the same exact card, you can spend way more money on it
This could perhaps bring some of the fan-favorite Eeveelutions not present in the title (namely Umbreon, Espeon, and Sylveon) to the mobile hit for the first time
I'd either go for the Doom Prevails or Avengers Assemble (Jeskai) Red, White and Blue