Like most Pokmon cards, the value of Magneton 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)
#4 Also, TheAnnihilator does alter work
you also have a chance to use some of your opponents cards as well
If you don't have a [Mirei Mikagura], you may play 1 [Mirei Mikagura] from your trash without paying the cost
While this doesn't affect value, it adds personality to the card and can help with identifying which specific printing of a card you have, as different printings sometimes use different Pokedex entries
Watermark: Goblin Explosioneers Illustrated by Wayne Reynolds Standard Not Legal Alchemy Not Legal Pioneer Not Legal Historic Not Legal Modern Not Legal Brawl Not Legal Legacy Not Legal Comp