Eternal Bond — Ruling

Effetto 1

This card's effect that Special Summons "Photon" monsters from your Graveyard is the effect that applies by activating this card. (It targets any number of "Photon" monsters in your Graveyard, and cannot be activated during the Damage Step.)

This card's effect that takes control of an opponent's "Photon" monster starts a Chain and activates in the Graveyard. (It targets 1 face-up "Photon" monster in your opponent's Monster Zone. Banishing this card from your Graveyard is the cost to activate this effect.)
This effect finishes resolving by taking control of the targeted monster. (The part of the effect that only allows you to declare an attack with that monster and changes its ATK is applied immediately once this effect resolves.)