A surprisingly powerful Basic Pokemon, Druddigon is best played in the Active Spot at the start of the game and then sitting there until you've powered up another Pokemon or two from your Bench
Im glowing
Katilda and Lier pop up in Innistrad: Midnight Hunts Equinox frame, and Omnath, Locus of all gets Zendikar Risings travel poster style
An easy upgrade for people playing Tuvasa the Sunlit, Hanna, Ships Navigator or even the more recent Alela, Artful Provocateur
Mana Geyser - A classic that gets exponentially stronger with the table
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)