ZW - Ultimate Shield

The monster effect "When this card is Normal or Special Summoned: You can target 1 of your banished Xyz Monsters; Special Summon it in face-up Defense Position" is a Trigger Effect. (It targets 1 of your banished Xyz Monsters. It can also be activated during the Damage Step.)

The monster effect "When this card is Normal or Special Summoned: You can target 1 of your banished Xyz Monsters; Special Summon it in face-up Defense Position" is an optional effect that can be activated when "ZW - Ultimate Shield" itself is Normal or Special Summoned face-up. (It can also be activated during the Damage Step.)

The monster effect "During your Main Phase: You can equip this card from your field to a 'Utopia' monster you control; it gains 2000 DEF" is an Ignition Effect. (It targets 1 "Utopia" monster you control in your Monster Zone.)

The effect that makes it "gain 2000 DEF" is an effect applied while "ZW - Ultimate Shield" is treated as an Equip Spell card by its own effect. (It does not start a Chain.)

The monster effect "You can only control 1 face-up 'ZW - Ultimate Shield'" is an effect that is not classified as an Ignition Effect, Trigger Effect, Quick Effect, or Continuous Effect.