The ideal way to estimate the value of Pokmon cards is to consult resale platforms between private individuals and/or professionals (called "Marketplaces" - for example: eBay or TCG Player) and analyze the resale values for each card you wish to estimate
A toploader binder is max protection for your chase cards
This allows for all sorts of unusual combo shenanigans like repeatedly sacrificing undying creatures and taking their counters, or constantly untapping Devoted Druid for limitless mana
10 Mecha Phantom Beast Coltwing If Coltwing is special summoned, the player can special summon two Mecha Phantom Beast tokens, as well
One example given is the legendary angel Sigarda, Champion of Light, which not only buffs humans but also has a Coven ability that allows you to look at the top five cards of your deck and put a human from among them into your hand when it attacks
Instead, I'd actually recommend using eBay directly to appraise your graded Pokmon cards