Illusion
Wall +12
Hides and shuffles 3 revealed cards in hand
Is it supposed to work in non-Hidden mode? Far Sight already has counters in Hidden with all the many hand-discards and Whirlwind, and it's sorta hit-and-miss to begin with, however valuable warning can sometimes be.
Aside from that, it's a cheaper Bricks-using Illusion common than Mirror Golem that also gives Wall, which are things the many struggling Illusion decks need (i.e. that alone might be a good reason to add it).