Kerzebs, the Gaoled Glutton

“2+ Level 7 monsters Gains 700 ATK for each material attached to it. Once per Chain, when a Normal or Quick-Play Spell Card is activated (Quick Effect): You can attach that card on the field to this face-up card, and if you do, this card is unaffected by that activated card. During the End Phase: You can Set 1 Spell Card that is attached to this card. You can only use this effect of "Kerzebs, the Gaoled Glutton" once per turn.”