Can Mushin No Shin be played on any card?
The ability is:


  Install an asset, agenda, or upgrade from HQ in a new remote server.
  Place 3 advancement tokens on that card. You cannot score or rez that
  card until your next turn begins.


Unlike cards like Shipment from Kaguya, Mushin No Shin has no restriction here that the card must be a card that can be advanced.

Thus, any card that can be installed in a remote server, namely any Agenda, Asset, or Upgrade, is a valid choice.  For example, you could use Mushin No Shin on a Snare!