Card Rulings:Double-Headed Dino King Rex

"Double-Headed Dino King Rex":

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OCG Rulings

• [Regarding the effect "If you control no monsters, you can Special Summon this card (from your hand)."]
  • It is not classified as either an Ignition, Trigger, Quick, or Continuous Effect.

• [Regarding the effect "If this card is Normal or Special Summoned: You can target 1 monster on the field with less ATK than the total ATK of all Dinosaur monsters you control; destroy it."]
  • It is a Trigger Effect that can be activated in the Monster Zone.
  • It can also be activated during the Damage Step.