Collectors often chase cards by favorite Pokmon, specific artists (like Mitsuhiro Arita or Naoki Saito), or unique art styles featured in promos and special releases
C-tier Magnezone (Electric / Space-Time Smackdown) Magneton charges up quickly, which means its evolution - Magnezone - can do 110 damage with only a single discard as penalty
The art comes from the 2010 Rise of the Eldrazi set, during the original Zendikar block, and is such a cool collectible to own.
And something like weighing packs just separates the casual hobbyists from the big-league collectors
And forget jumping through hoops to up the Fog's restriction with your deck
I tend not to play planeswalkers or Wheel of Fortune in RDW as they cost too much mana, I also tend not to play Chaos Warp or Tangle Wire as they don't deal damage and can wind up as dead cards too often