Some attach to creatures as Auras, while others affect the entire game state
Use a website like pokecardmaker.net or get out some paper, pens, and coloring materials (colored pencils, markers, paint, etc.)
Like most Pokmon cards, the value of Magikarp 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 (Detective Pikachu)
Its also a completely reasonable 3-mana ramp spell
The idea here is that once you explore and Amalia hits 20 power, itll wipe out all other creatures and get in a clean attack for an auto-win
Fire-type Pokemon have always carried a pricing premium in the TCG -- just look at what Charizard does to any set it appears in -- and Flareon benefits from that same energy