Unicorn: Allow the spell to grant Barrier as well as enchant, cleanse, and life. That will give it a bit less of a turn-disadvantage.
Brian: Can still be devastating if he hits magic on the right troop. Completely marginalized by now having a better options with board mod (Humility), but at least unique within his colors. Hes fine where he is, just not very relevant to the meta because you can’t waste a turn and a team slot for a chance at getting a favorable effect that makes up for the loss of the slot and the turn.
Though I have to strongly disagree that he somehow “counters” goblins. Brian does not even begin to counter anything goblins have to offer. A single slayer trait does not a counter make.