Like most Pokmon cards, the value of Infernape LV.X 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 (Diamond & Pearl)
While the basic 'discard and draw one' Cycling card is by far the most common type, there are a large number of cycling variants
Most relevant to Unstable is the fact that full-art lands simply aren't as unique or special as they once were
As a downside, you cant just pack your deck with these in place of four lands
Ashiok, Dream Render is an example
If an effect copies a prototyped spell, that copy (as well as the token it becomes on the battlefield) will have the same characteristics as the prototyped spell