While Fog is not nearly as splashy as other spells, without access to counter magic, sometimes the best way to gain an advantage is to simply blank an entire attack step
Hina is probably our strongest cost reduction play, giving a -4 cost reduction to one of the opponents Characters through her On Play effect
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Plus, you get to align yourself with one other player which is sometimes better than granting the whole table an extra card
The second is more short term, based on the fact that UW Flash and GB Delirium currently make up about 50% of the Standard meta, which is a historically high metagame share, and cards like Archangel Avacyn, Spell Queller, and Emrakul, the Promised End have the ability to invalidate entire archetypes all by themselves, especially in our current answer-lite Standard