Effect
Cannot be used as a Fusion, Synchro, or Xyz Material for a Summon. While this card is face-up on the field, it cannot be Tributed. When this card on the field is destroyed: The controller targets 1 Spell/Trap Card they control; return that target to the hand. You can only control 1 face-up "Green Duston".
The monster effect "This card cannot be Tributed" is a Continuous Effect.
"Cannot be used as Material for a Fusion, Synchro, or Xyz Summon" is not treated as a monster effect. (You cannot use "Green Duston" as material even if it is in your hand or Graveyard, or if it is in face-down Defense Position.)
The monster effect "When this card on the field is destroyed: Its controller chooses 1 Spell/Trap Card they control and returns it to the owner's hand" is a Trigger Effect. (The player who controlled the "Green Duston" at the time it was destroyed on the field chooses 1 Spell/Trap Card they control as the target. This effect also activates during the Damage Step.)
The monster effect "You can only control 1 face-up 'Green Duston'" is an effect that is not classified as an Ignition Effect, Trigger Effect, Quick Effect, or Continuous Effect.
Continue with related public research
From this rulings page you can jump back into card data, set archives, tournament decks, banlist checks, and market movers.
Card database
Search Yu-Gi-Oh! cards, archetypes, stats, and printings.
Set archive
Navigate booster sets and inspect all cards in each release.
Tournament decks
Browse competitive decklists, player finishes, and archetype trends.
Banlist status
Check the current status of Yu-Gi-Oh! cards on the banlist.
Market movers
Track the top Yu-Gi-Oh! price gainers and momentum cards.