By the looks of things (and judging by MTG Goldfish's price tracker) the Modern Masters 2017 version is the one that's gone up in value the most, from $11.80 at the start of June to $35 now
The most expensive Pokmon card ever sold is the Pikachu Illustrator promo card, which was sold for a whopping $5,275,000 in 2022

Elemental Mascot Elemental Masterpiece Elemental Summoning Emberwilde Caliph Enigma Drake Enthusiastic Mechanaut Epic Experiment Eris, Roar of the Storm Eruth, Tormented Prophet Essence Backlash Etherium-Horn Sorcerer Exalted Flamer of Tzeentch Expansion // Explosion Expansion // Explosion Experimental Overload Expressive Iteration Farideh, Devil's Chosen Fearless Swashbuckler Fell Beast's Shriek Fevered Visions Firemind's Foresight Firemind's Research Firestorm Hellkite Firkraag, Cunning Instigator Flame of Anor Flaring Cinder Fluxcharger Frenetic Efreet Frenetic Sliver Frost Fair Lure Fish Frostburn Weird Frostcliff Siege Gadget Technician Galazeth Prismari Galvanic Iteration Gandalf the Grey Gandalf's Sanction Gelectrode Ghyrson Starn, Kelermorph Gitaxian Spellstalker Glacial Dragonhunt Gleaming Geardrake Goblin Electromancer Goblin Flectomancer Goblin Test Pilot Hawkeye, Avenging Archer Heaven Sent Herald of Kozilek How to Keep an Izzet Mage Busy (playtest) Hustle // Bustle Hypersonic Dragon Hypothesizzle Ian Malcolm, Chaotician Iceman and Firestar Idris, Soul of the TARDIS Ill-Timed Explosion Improbable Alliance Inside Out Inspired Skypainter Intruding Soulrager Invade the City Invasion of Kaladesh Invasion of the Giants Invert // Invent Invert // Invent Invert Polarity Invoke the Firemind Ionize Iron Lad, Young Avenger Iron Man, Master of Machines Iron Man, Titan of Innovation Izzet Charm

However, they might not be as direct, cost more mana, or have a downside, such as only being there until the end of turn or requiring a sacrifice or a life cost
The life gain played by normal decks to sure up their matches against agro decks has to minimally impact the deck in their other match ups however in decks that are really abusing life as a resource such as Necropotence you typically need some life gain just to enable the continued use of your effects