Particularly valuable cards were found in the 'Shiny Vault', which were foil, shiny versions of popular Pokemon, and leading the way in that was this shiny Charizard VMAX
(This creature cant be blocked except by two or more creatures.)
For example, Mycosynth Lattice doesn't allow mana from Vedalken Engineer to be used to cast a nonartifact spell
For that reason, Im intrigued by some of the older and coolest Giants that would seem to be easy inclusions in a Giant tribal deck, like Cunning Giant from Portal and Frost Giant from Legends
The resale premium alone justifies the slightly higher cost
You want a bunch of cards that synergize with treasures, like Goldspan Dragon, Academy Manufacturer, or Reckless Fireweaver