Whats your favorite energy card
Often, cards or even entire archetypes that were once meta dominant in the TCG or OCG end up completely unplayable or rogue at best in Duel Links, due to the difference in game mechanics -- e.g
Either (A) they picked a stronger card in the Abzan colors (perhaps possible for the player who opened the pack if there was a bomb rare) or (B) they aren't drafting Abzan (more accurate is to say that they weren't drafting Abzan at the time they made the pick)
The Phantom Knights of Mist Claws The Phantom Knights of Break Sword The Phantom Knights of Rusty Bardiche Link 3 DARK Warrior Link Effect Monster ATK 2100 Links: Bottom Left, Bottom Right, Right Materials: 2+ DARK Monsters During your Main Phase: You can send 1 The Phantom Knights monster from your Deck to the GY, then Set 1 Phantom Knights Spell/Trap directly from your Deck to your Spell & Trap Zone
It's not just the card itself that people are paying for, though
33 Bellibolt This simplistic Illustration Rare places Bellibolt in the corner of a cave