Best Two 3-Mana Spells for "Signature Spells" enchantment?

Hey all, I spent a wildcard on what might be my new pet card [[Signature Spells]] and I had the idea to build a deck with only two 3-mana instants/sorceries, that way it always seeks the same two spells every time.

For reference, I plan on throwing this in a [[Cormela, Glamour Thief]] deck but i'd still like to hear your best ideas for the card in all colors. So far I think the answer for a Cormela Deck would be [[Saw In Half]] & either [[Seething Song]] or [[Frantic Search]]

Has anyone else played this card with any success before? I'd love to hear some card feedback