Effect
2 Level 4 monsters Once per turn: You can detach 1 material from this card, then target 1 "Gagaga" monster you control; it can make a second attack during each Battle Phase this turn. When another monster you control is targeted for an attack while this card is in Attack Position: You can change this card to face-up Defense Position, and if you do, change the attack target to this card and perform damage calculation.
The monster effect "(1): Once per turn, you can detach 1 Xyz Material from this card, then target 1 'Gagaga' monster you control; that monster can make a second attack during each Battle Phase this turn" is an Ignition Effect. (Detaching 1 Xyz Material from this card is a cost to activate this effect. This effect targets 1 "Gagaga" monster you control.)
The monster effect "②: When an attack is declared involving another monster you control: You can change this card to face-up Defense Position, and if you do, change the attack target to this card and perform damage calculation" is a Trigger Effect that you can choose to activate. (This effect does not target.)
The process of "change this card to face-up Defense Position" and the process of "change the attack target to this card and perform damage calculation" are not treated as occurring simultaneously. (By resolving this effect, you enter the Damage Step and proceed until damage calculation.)
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