You can search for it using Vision Resonator, and youll be thankful when you do, as youre able to then search for any card that mentions Red Dragon Archfiend and add it to your Hand from either your Deck or Graveyard
Creature, land, artifact, you name it, Vampiric Tutor can get it, and get a win condition, board wipe, or anything else you might need given the current game state
While not mentioned in the FAQ, another reason is that placing tabs will add extra thickness to the surface, and if you had tabs attached to roughly the same spot on all sleeves, that thickness will add up to form reliefs and damage the cards if the band you use to hold the cards was too tight
Many of you might now be wondering why Im telling you this
The format is adding more and more must-play cards and the days of EDH being a bulk rare format are over