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 monster in their Graveyard; shuffle that target into the Deck. You can only control 1 face-up "Yellow 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 "Yellow 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 can target 1 monster in their Graveyard; shuffle that target into the Deck" is a Trigger Effect. (The player who controlled the "Yellow Duston" at the time it was destroyed on the field targets 1 monster in their own Graveyard. This effect can also be activated during the Damage Step.)
The monster effect "You can only control 1 face-up 'Yellow Duston'" is an effect that is not classified as an Ignition Effect, Trigger Effect, Quick Effect, or Continuous Effect.
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