Three main factors determine value: rarity (Secret Rare, 1st Edition, etc.), condition (graded on a 1-10 scale where PSA 10 is flawless), and demand (popularity of the Pokmon and competitive playability)
Brawl Not Legal Vintage Not Legal Timeless Not Legal Commander Not Legal Pauper Not Legal Oathbreaker Not Legal Penny Not Legal Domri, Chaos Bringer Emblem Emblem Domri At the beginning of each end step, create a 4/4 red and green Beast creature token with trample
The one card thats not about pure, sheer power or card advantage battles to (mostly) make this list
But when our general is in play, they all become a bit more potent
Many players are now able to use the card's high HP and self-healing ability after collecting it in promotional packs
Factory sealed booster box