(Since "Shining Sarcophagus" cannot be destroyed by monster effects, it'll remain on field as "Gandora-G" uses its effect.) "Ties That Bind", often used to summon "Silent Magician Zero" and "Silent Swordsman Zero" as endboard pieces
For Deck building, there are a couple of directions you could go in to make the most of this Skill, we would recommend trying to keep a balance of Harpie and Amazoness monsters to improve the odds that you can use your Skill on the very first turn and begin setting up to get the second effect
They provide an extra layer of protection to the card
5 Psychic Wave Mills Jinzos for Consistency Battles of Legend: Armageddon Jul
I'm guessing what you wanted by the Spells not going to the grave was to activate them once per turn, but even if they stayed on the field as Continuous Spells, you wouldn't be able to activate them again because they were already activated
Dragon / Fusion / Pendulum / Effect 1 Fusion monster + 1 "Clear Wing" monster [1] Once per turn, if your opponent Special Summons a face-up monster(s): You can target 1 of them