Effect
If your opponent controls a face-up Xyz Monster, you can Special Summon this card (from your hand). When you do: Target 1 monster your opponent controls; that monster loses 300 ATK.
The monster effect "If your opponent controls an Xyz Monster, you can Special Summon this card (from your hand)" is not classified as an Ignition Effect, Trigger Effect, Quick Effect, or Continuous Effect.
A Chain Link is not created when performing a Special Summon via the monster effect of "Pakubagu".
The monster effect "When Special Summoned this way: Target 1 monster your opponent controls; that target loses 300 ATK" is a Trigger Effect. (This effect targets 1 face-up monster in the opponent's Monster Zone.)
The monster effect "that target loses 300 ATK" is an effect that must be activated when "Pakubagu" is successfully Special Summoned by its own monster effect.
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