The mono-white version of Cloud focuses on Equipment, triggering his own and his Equipments' abilities an extra time, allowing you to double-up on benefits and build Cloud into an unstoppable behemoth
You have no maximum hand size regardless of what your life total is
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Some reduce the cost of enchantments, some reduce colored spells, and some work on both
Take a card like Doubling Season, for example, which is an essential Commander card, but currently obnoxiously expensive
You can +1 him to force your foes to lose 2 life unless they discard a card, and in Commander that's likely to be the two life