You can only activate this card if there are no cards in your Graveyard. Select 1 removed from play monster and Special Summon it on your side of the field.
Rulings
Individual Card FAQs
Your Graveyard only has to be empty when you activate "Dimension Distortion", so if an effect is chained that puts a card in your Graveyard, "Dimension Distortion" still resolves.
"Dimension Distortion" can only Special Summon a monster that is face-up while removed from play (cannot Special Summon a monster removed with "Lightforce Sword" or "Different Dimension Capsule").
"Dimension Distortion" can Special Summon "Dark Ruler Ha Des".
When a "Special Summon-only" monster is removed, without returning to the hand or Deck, after it is Special Summoned properly, it can be Special Summoned by "Dimension Distortion".
Spell|
Normal