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Its effect, loosely paraphrased, says that whenever an opponent casts a creature spell that doesnt share a color with creatures you control, counter that spell unless that player pays an additional cost

If, among the 5 mythic lands, Wizards prints just ONE good card, it's going to be in all of the decks that run that color

In a sense, they are the Traps that sit in your hand at the start of the duel, making it important for you to have them if youre forced to go second

So how do I know if one card is worth a lot

A first-edition Neo Genesis Lugia graded PSA 10 sold on eBay for $129,000 in November 2020, and PWCC auctioned a Pristine BGS 10 Lugia #9 for $144,300 in May 2021