You can obtain them by opening booster packs using Pack Hourglasses
In theory, a hand of two Dark Rituals, a Swamp, Chrome Mox, Painter's Servant, Grindstone, and any black card to pitch to Chrome Mox offers exactly enough mana for the Turn 1 win
As much as I do not really respect the UB teachings control decks in pauper, it is cool how they can sometimes get out x2 pristine talisman, and buyback evincar's justice to essentially lock my goblins deck out of the game
Full deck lists and detailed upgrade guides will be available as spoiler season completes over the next few weeks
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The three fast-mana cards are available in relatively low numbers and are extremely powerful in casual and competitive MTG Commander