Since you spent the turn cheating an octopus into play, Unagi's Spray can be just the trickery you need to defeat an attacker or trigger a second draw
Skyridge cards (those with the silly asymmetrical yellow border) and the reverse holo with the set name stamped are interesting too, and pretty hot right now
With an Attack Power of 1 and Health Points of 5, Rapunzel Gifted with Healing combines her gentle nature with a sturdy presence, making her a valuable asset in your deck
You can have a card like Crystallization in your Jegantha deck, or Evelyn, the Covetous since the , , and mana symbols are all different
Trophy cards attract buyers who want to own "the one" that represents the entire hobby, and they are willing to pay a premium for that status