Very few in the Why Bother Lounge are Extended-legal
The top of the rarest MTG cards list: Black Lotus (Beta artist proof) Mind Twist (Beta) Lord of the Pit (Alpha) Copy Artifact (Beta) Black Lotus (Beta) Further down the list: Mox Ruby, Ancestral Recall, Volcanic Island, Time Walk, Underground Sea, Mox Emerald, Timetwister, Mox Sapphire, Mox Jet, and Foil Intuition (Judge Promo)
While Lunala's best cards are primarily from Cosmic Eclipse, this Pokemon managed to pack plenty of valuable chase cards into one set
For just 1 mana, you can toss it into the graveyard and grab a mountain, setting up one of the most busted early-game plays in formats like Pauper or even Legacy: Cast Reanimate or Exhume and bring it back on turn 1 when paired with Dark Ritual
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Promo Cards in PTCGP generally don't do anything different to the base card (with a few exceptions), they're simply rare variants won as awards for specific missions, subscriptions or limited-time challenges