Several factors influence Mega Evolution card values: card condition (mint cards worth 3-5x more), rarity (holographic and rare cards command higher prices), first edition status, PSA/BGS grading scores, and market demand for specific Pokemon
Pokmons existent fan base have a historical penchant for quickly snatching up limited-edition collectibles, and the trading card game has been enjoying (though some may say suffering from) explosive popularity since the COVID-19 pandemic, especially when rare and highly valuable cards are involved
Adamaro, First to Desire Descendant of Kiyomaro Descendant of Masumaro Descendant of Soramaro Fumarole Gaze of Adamaro Greensleeves, Maro-Sorcerer Kagemaro's Clutch Kagemaro, First to Suffer Kiyomaro, First to Stand Magmaroth Maro Maro Avatar Maro's Gone Nuts (playtest) Masumaro, First to Live Molimo, Maro-Sorcerer Multani, Maro-Sorcerer Soramaro, First to Dream Territorial Maro Tundra Fumarole Umaro, Raging Yeti Wandering Fumarole
Thus, while one can beat Pokmon Red and Blue almost exclusively with a starter Pokmon, that is not the best approach for your average 6-10 year old
If Wizards removed cards from the Reserved List once thanks to "overwhelming public support," it seems possible that, with enough of a push from the community, it could happen again
And critically, it will not be summoning sick if the original target wasnt allowing you to add hasty power to your attack by mutating something big onto something small
