Some cards are natural buildaround cards, which are only good if you build your deck to maximize some aspect (sacrifice creatures, combat damage, spellslinger)
Landorus also provided some unexpected help in the Raikou/Eels matchup, which is largely unwinnable for Seismitoad decks, unless you can lock them out of the game early on
The market is volatile, and while Pokmon cards have historically appreciated, the same trajectory is not guaranteed for all items, including the Pokmon 151 collection
Cards range from pack-fresh to lightly handled
Dragon's Claws seen tournament sideboards, and Kraken's Eye is fantastic with mono-blue Eye of the Stormall cards off it are cast, making everyone play blue if you like
This combo works particularly well, because both pieces are colorless, meaning you can technically pull off the win regardless of your decks color combination