The charms, for those unaware, was R&D revisiting a theme first used in Mirage and Visions
Even commodities with clear levels of use-value demand like gasoline, eggs, or palladium fluctuate in price for similar reasons, a combination of demand, investment speculation, and, if not always nostalgia, at least some form of emotional connection to a product that seems stronger than its value in use or consumption
Galathul Galecaller and Limitless Rekindling are contained by Alchemy: Strixhaven and only on Arena, and they are quite cool if you can pull them off
Even if Guildpact Paragon is useful on its own for endless resource recycling, you still have to sit through five mana and four defense counters before you can get to the actual juicy effect