Googly-Eyes Drum Dragon

The monster effect "Once per turn: You can detach 1 Xyz Material from this card; this card gains 1000 ATK until the end of the next opponent's turn" is an Ignition Effect. (This effect does not target. Detaching 1 Xyz Material from this card is a cost to activate this effect.)

The monster effect "If this card with Xyz Material is destroyed: You can banish 1 'SD Robo' monster from your Graveyard; Special Summon this card from your Graveyard, then you can choose 1 'SD Robo' monster in your Graveyard and attach it to this card as an Xyz Material" is a Trigger Effect that activates in the Graveyard. (This effect does not target. Banishing 1 "SD Robo" monster from your Graveyard is a cost to activate this effect. This effect can also be activated during the Damage Step.)

The process of "Special Summon this card from your Graveyard" and the process of "then you can choose 1 'SD Robo' monster in your Graveyard and attach it to this card as an Xyz Material" are not considered to happen simultaneously.

The process of "Special Summon this card from your Graveyard" must be performed, but you can choose not to perform the process of "then you can choose 1 'SD Robo' monster in your Graveyard and attach it to this card as an Xyz Material."

"End of the next opponent's turn" in the text "this card gains 1000 ATK until the end of the next opponent's turn" is read as "end of the next opponent's turn." (Applied from July 10, 2014)