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Soul Sear / Rebel Salvo 3 Technically Rebel Salvo is better but I cannot see it being that much less than 2.9 mana on average in cubes

Deck 9.5 10 Vera the Vernusylph Goddess Effect Monster - 8 Fairy 2400 3000 Once per turn, when a monster effect activated by your opponent resolves, if you control 5 or more EARTH monsters, you can negate that effect, and if you do, destroy that card

however, resolving a card like Prologue to Phyresis or Walking Ballista before going off will make it trivial to end the game from there

Spectral Sailor is your best one-drop, and probably would be even if it was just a textless 1/1 flyer with flash, but its card draw ability is dramatically more relevant than you might realise at first, as it helps you pull ahead in card advantage in the games where your Curiosity-effect engine is broken apart