While commons might not come to mind when you think of valuable cards, quite a few are worth a pretty penny, particularly those from older sets
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Getting artifacts isnt hard not only are 50% of whites creatures and blues tokens artifact creatures, but the overall focus on artifact tokens (and complementary red artifact theme) mean there should be plenty to splash for even if you find this archetype contested
However, Pokemon like Aerodactyl have special Poke-Bodies that take advantage of being loaded up with these Energy cards
Excalibur II Youll need a ton of lifegain support for Excalibur II to be good, as it does absolutely nothing without it (unlike Minwu, White Mage or Aerith Gainsborough)
Assessing Card Condition Subjective in nature, accurately determining card condition is an essential skill that one need become proficient at