You can discard this card; add 1 "Bonding" Spell/Trap from your Deck to your hand. If this card is Normal or Special Summoned: You can target 1 "Hydrogeddon", "Oxygeddon", or "Duoterion" in your GY; Special Summon it. You can only use each effect of "Duoterion" once per turn.
Bonding - D2O requires 2 “Duoterion” and 1 “Oxygeddon” from your hand or the Field to be Tributed in order to Special Summon Water Dragon or Water Dragon Cluster from your hand, Deck or Graveyard. Additionally, if Water Dragon or Water Dragon Cluster was sent from the Field to the Graveyard while this card is in the Graveyard, you can add this card to your hand. Bonding - DHO can shuffle 1 “Duoterion”, 1 “Oxygeddon” and 1 “Hydrogeddon” from your hand or Graveyard, back to your Deck to Special Summon Water Dragon or Water Dragon Cluster from your hand or Graveyard. Additionally you can banish this card from your Graveyard to retrieve 1 “Water Dragon” or “Water Dragon Cluster” from your Deck or Graveyard to your hand.