Several factors influence Aquapolis 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
A pet deck style of mine is Miracle Grow: you play cheap creatures that grow as you play spells and protect them with light disruption while they finish the game for you
Most of that comes from playing about 30 high-quality rare/mythic creatures, but there are plenty of cuts along the way to help ease the pain of buying so many singles
Thank you for visiting, let's go over this deck called: Ultimate conductor tyranno
Theres also a subsection of collectors who value artwork and cuteness level above all else
such as using "Morpheus, the Dream Mirror Black Knight" for disruption and "Morpheus, the Dream Mirror White Knight" afterwards to protect the lower level "Dream Mirror" monsters from attack