Like most Pokmon cards, the value of Staryu 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 (Skyridge)
Mind Over Matter untaps more permanents than just artifacts, so its kind of bigger than this list, but it does specify artifacts so were going for it
Add one of Pokmons most iconic characters to your graded collection with Pikachu ex Special Art Rare #234, professionally graded PSA 10 Gem Mint
Higher-value cards require more expensive service tiers with different declared value limits
If you can attach an Eviolite to a Darkrai EX and get two Serperiors in play, all attacks are basically doing 60 less to Darkrai EX
You are going to need your opening hand to usually be made up of a mixture of these parts, but some are more important than others