Any battle damage this card inflicts to your opponent is halved unless it has "Galaxy-Eyes Photon Dragon" as material
The most important factors are edition (1st Edition, Shadowless, Unlimited), condition (mint cards command premiums), rarity (holographic, secret rare, full art), age (vintage Base Set cards are highly sought after), and the Pokemon itself (Charizard, Pikachu, and fan favorites are worth more)
The "Black corners" option does insert squared black corners on the cards
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"Not all of them are expensive, some of them you can find for $15-30, some of them you can easily pay $500." What cards could Lyles pull out next
You might remember a few months ago when I suggested opening a TCGplayer seller account (which I still recommend doing), but for the purposes of checking the last sold listing measurement tool to gauge whether there was real demand for a card