Yes, they keep pushing Clash, but with so many removals, no one will trade for Clash. Attaching Clash to Rush is a great idea. Attaching it to Ward is not bad either; you'll have to remove the Ward anyway, even if there are no removals. Attaching it to a strong creature gives Tier 2 a chance, where everyone tries to pull off removals, but there are fewer of them than in ranked matches, and you need to remove those strong creatures. But just spamming a bunch of cards with Clash that no one will actually use – I don't know.
In short, Clash is good.