These are variants rather than a separate power level, but they drive much of the secondary market, since a competitive card's alternate art often outsells its base Secret Rare
The Type Line You can figure out what any card is by reading the type line
This card is in possession of @linkdu83 , who might have some better pictures and more information about these
That said, some individual cards that just happen to be knightslike Bloodthirsty Conqueror, Imodane's Recruiter, and Moonshaker Cavalryare among the top-performing knights in competitive play, especially in popular Constructed formats
Nezahal, Primal Tide Nezahal, Primal Tides abilities can give you huge card advantage in a game
Several factors influence Base card values: card condition (mint cards worth 3-5x more), rarity (holographic and rare cards command higher prices), first edition status, PSA/BGS grading scores, and market demand for specific Pokemon