There's also Hammer Crush Deal, which essentially makes Hammer Crush (a Mystical Space Typhoon with a discard cost) effectively free by setting Hammer Crush then immediately drawing a card, and decks playing it often forgo strategy in favor of simply cramming in Level 4 Normal Monsters with 1500 ATK (the strongest non-Tribute monsters in the format) along with a variety of generic boss monsters
Collectors and players alike are drawn to its unique features, placing it among the 10 most valuable Pokmon cards in Paldea Evolved
Renegade Rallier Renegade Rallier basically requires you to replay fetch lands, but who doesnt love extra fetches
Quuador: A lot of this (almost all) was done by @justinator before I started collecting and before I joined this forum, but we both still discover new Pikachu cards almost monthly, even from as far back as 1999
That said, even this Secret Lair has a decent chance of recouping its costs, depending on the markup for these premium printings