So despite this being just a Basic Energy card, not known for holding their value, perhaps the gold variants scarcity, along with the fact that its now a defunct Energy type, has contributed to it holding a pretty high value

19-20 35 xp increase 21-22 40 xp increase 23-24 45 xp increase 25 might be at 890 for a 50 xp increase Palworld Walkthrough & Guides Wiki Genshin Impact Walkthrough & Guides Wiki Zenless Zone Zero Walkthrough & Guides Wiki Honkai: Star Rail Walkthrough & Guides Wiki Digimon Story: Time Stranger Walkthrough & Guides Wiki Wuthering Waves Walkthrough & Guides Wiki Umamusume: Pretty Derby Walkthrough & Guides Wiki Granblue Fantasy: Relink - Endless Ragnarok Walkthrough & Guides Wiki Arknights: Endfield Walkthrough & Guides Wiki Pokemon Champions Walkthrough & Guides Wiki Elden Ring Shadow of the Erdtree Walkthrough & Guides Wiki Fire Emblem Heroes (FEH) Walkthrough & Guides Wiki Pokemon Brilliant Diamond and Shining Pearl (BDSP) Walkthrough & Guides Wiki Diablo 4: Lord of Hatred Walkthrough & Guides Wiki Super Smash Bros
The last cards I bought, I think, were from the Unglued set, although I think I still have my old green-red Saproling deck somewhere
"I set one card in the back row and play Vampire lady in attack mode
Video instruction (Kirin & Picking Bones)
Outside of the two legendaries with modular printed on them, there are plenty of commanders that work with +1/+1 counters or artifacts