This card’s effect activates in the Graveyard. If
"Destiny Hero - Double Dude" is removed from play its effect will not activate.
If
"Destiny Hero - Double Dude" is destroyed and sent to the Graveyard while in the hand or Deck his effect still activates, and you can Special Summon the 2
"Double Dude Tokens". He could be destroyed in the hand or Deck by effects like
"Neo-Spacian Aqua Dolphin" or
"Chain Destruction".