Keep them sealed if your main goal is collecting sealed products, but remember that condition, set popularity, and scarcity matter
Which sphinxes are your favorites
For the most part, you can pretty much ignore devoid as it relates to gameplay
As such, Historic's banlist is fairly large since there's been plenty of powerful cards released in Magic Arena (largely thanks to bonus sheets)
Other red flags to look out for include upside down Pok Balls, disproportionately cut edges, and blurry or smudged prints
It has everything to do with the cards visual impact, its scarcity in high-grade condition, and a growing recognition that the e-Card eras Dragon-type icons are among the most undervalued cards in the entire catalogue