Once your treasures are in hand, you can continue playing value spells on the same turn, save them up to respond to a threat and/or make a bigger play later on, or hoard them so you can attack someone with an unexpectedly powerful creature
Low-cost characters (Captain Hook, Forceful Duelist and Goons, Maleficent's Underlings) can do much the same thing, running interference as you prepare
For the low price of exiling three cards and paying for the card again, it gets to come back into play to cascade all over again
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From my time with these decks, these Amethsyt/Steel cards seem fairly powerful - and potentially even overpowered
As for this deck's commander, popular choices include similarly controlling leaders like the Grand Arbiter or more aggressive creatures that seek to put beleaguered opponents out of their misery quickly, like Harbin, Vanguard AviatorHarbin, Vanguard Aviator, or Raffine, Scheming SeerRaffine, Scheming Seer