After playing a bit more and testing out a few builds, I think it'd be pretty cool if the Golem got a rune that made upgrading the Smith and Obelisk more appealing. Right now, handing out hand upgrades feels less exciting than focusing on something like Shimmer Spirits + Dawning Elk, Herd Elk + Retain, or Roots Dryad + Mirror, so having a card that makes that better would be nice. I kinda like the idea of something simple like "whenever a card in your hand is upgraded, Golem copies that upgrade".