Like most Pokmon cards, the value of Turbo Patch depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Darkness Ablaze)
Then add in that its legendary and toward the top end of said deck and I dont see Kumena, Tyrant of Orazca as a four-of even in U/G Merfolk
In slower formats of years past, it was more difficult to build up a game-winning field with speed, offering players more opportunities to counter their opponent in a way that made the steep cost difficult to justify
Look for sellers who explain their sourcing, offer authenticity guarantees, and have third-party reviews
Collecting Pokmon Cards Look for reasonably priced Pokmon cards you can sort through
Cards that push the limits of design is what excites them