Lightning Chidori

Regarding the effect "When this card is Xyz Summoned: Target 1 Set card your opponent controls; return it to the bottom of the owner's Deck": * This is a Trigger Effect that activates in the Monster Zone. * This effect targets 1 Set card your opponent controls. * This effect must be activated when this card is Xyz Summoned. * This effect activates and creates a Chain Link even if there is no correct card to target on your opponent's field. (In this case, since no target is selected, no processing occurs.)

Regarding the effect: "You can detach 1 Xyz Material from this card, then target 1 face-up card your opponent controls; place that target on top of the Deck." * This is an Ignition Effect that can be activated in the Monster Zone. * Detaching 1 Xyz Material from this card is the cost to activate this effect. * This effect targets 1 face-up card your opponent controls. * You can also target Fusion, Synchro, Xyz, or Link Monsters. In that case, that monster is returned to its owner's Extra Deck face-down. * If the targeted monster is no longer face-up in your opponent's Monster Zone when this effect resolves, the effect is not applied.