yugioh 5ds jack deck Will and Aki each receive 1 TCG-exclusive card in the Legendary 5D's Decks Collector's Set? : r/yugioh Yu-Gi-Oh 5D's: Everything You Didn't

It is one of the many prize cards that allow you to win the match by attacking with a specific monster (in this case Pendulum)

Thunder King, the Lightningstrike Kaiju Thunder King, the Lightningstrike Kaiju Thunder Effect C Common R Rare R Rare Related Cards View as Gallery View as List Dogoran, the Mad Flame Kaiju X FIRE Level 8 [ DinosaurEffect ] ATK 3000 DEF 1200 You can Special Summon this card (from your hand) to your opponent's field in Attack Position, by Tributing 1 monster they control

Modern Pokemon has a flavor of the week nowadays

All the Twilight Masquerade ACE SPEC cards are valuable to an extent, but this one stands out as a winner