Keep him as the strongest hero, but he must not outperform fully inspired teams with a single copy. Everybody will try to get him, and thus other mechanics will become obsolete. There is no challenge...
#Nerf Rook.
grizzled plinth
forest dune
Sweet summer child, as we have already been told, balancing will only be done by introducing new heroes, so don't worry, in half a year you will be given a chance to pull out a new Rook 2.0, which will be superior to the old one in everything. And for spending time and money on collecting other heroes - thank you very much.