A handful of cards help protect characters or heal their damage, including the Dinglehopper, which can continuously remove a point of damage every turn
To move a counter from one permanent to another, the counter is removed from the first permanent and put on the second
These cards all fit into the focus areas I talked about above
A handful of buyers have bit the bullet on the double-digit prices for this 13-year-old Common, presumably to bling out their Commander, Pioneer, or Pauper decks where Hidden Strings can combo off with Lotus Field or High Tide
Sapphires secondary theme is items matter
Many serious Modern players are going to want complete play sets of this entire cycle for their quiver, and Commander players will find reasons to want them too