It works wonders when paired with cards like Supreme Verdict or Utter End, since you can recover a mix of removal, control effects, and threats all at once
With DereviDerevi at the helm, you simply have to pay her mana cost plus once shes back in the command zone, and she flutters directly into play no questions asked
White also gives us Ruin Ghost and Murasa Rootgrazer, the latter of which can help us by picking lands up if we need to go off without the aid of a bounceland
More importantly, it means that players are able to carry over their unspent mana from a given turn rotation to the next
Gone are the days people would run commanders just because they were the colours they wanted access to Card advantage every top commander provides card advantage in some way, whether its literally drawing cards, card selection via scrying or similar, bringing cards back from the graveyard, tutoring, or even producing permanents such as tokens