Blur can become a solid card off the back of a little uncontrolled Block generation. Something like Anchor which always makes you Block on turn 1, or Horn Cleat for turn 2. Since those relics don't necessarily end up generating Block on a turn you're actually being attacked, having them makes it more exciting to put Blur into your deck, since it has a huge upside of carrying the Block to a relevant turn. Later in the game, Blur fits into decks which generate lots of consistent block as well.
