Like most Pokmon cards, the value of Scyther 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 (Stormfront)
"We view [ Pokmon TCG Live ] as more of an extension of the physical trading card game
Instead of four-color printings, a traditional foil card takes eight or more to account for printing over this WUP layer
Because of this, cards like Radiant Alakazam, Munkidori and Dusknoir have all become staples of the current format
Note: The card prices all come via TCGPlayer's Market Price History (with two notable exceptions) over the past calendar year and are subject to change
These pictures come in handy if the grade it gets is way off from your guess