The Handoff If you can't overcome your past self, the sacred power of Light will not accept you
Those other volatile mechanics like dredge and storm have their own ways to shatter underlying assumptions about the tempo of a match, but none are quite as blatant or as versatile as having a second, cooler mana pool
If you arent just buying singles, my recommendation is easily Commander Legends
They are alternate art versions of cards in the main set, they have no borders, a special rainbow foil treatment, and a special rarity symbol
Ancient MTG sets like Antiquities might fetch even more on the secondary market, but for a product released in this decade, this is frankly an astonishing figure
Players then go through any of the following actions any number of times until they cannot perform any more actions, or choose to end their turn: Play a card, Use a character ability, Use an Item, Quest, and/or Challenge an opponent's exerted character