The only one with a clear home is Sink into Stupor, which will likely replace Lorien Revealed in many decks, though I dont think that will be super impactful
Not only can you get a big discount on your sorcery spells during your combat step, but you can also keep mana open to cast powerful sorcery spells on your opponents turns, allowing you to cast counterspells or other interaction if necessary
The same is true for counters that change its power or toughness (such as +1/+1 counters)
This is good stuff to its most detrimental degree, though its undeniably powerful

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Even simply untapping your commander can be a big deal, as many commanders have powerful tap abilities