Lim Dul's Vault 10 This is probably the actual best tutor for these kinds of archetype
How can that not be a smile
The common was heavily played in decks prior to the printing of Arcane Signet, and now many have replaced it, but I generally prefer this unless I have a four drop Commander to drop third off a second-turn Arcane Signet
Beyond that, if your board is littered with a lot of blue pips after playing cards such as Future Sight, Arcanis the Omnipotent, Azami, Lady of Scrolls or any other cards with blue in their casting cost which, if youre playing Wizards, will likely be most of them then the ability to win the game on the spot becomes even easier, making this tricky little Merfolk an unassuming yet powerhouse threat for Wizards
Cityscape Leveler: Cityscape Leveler is one of the biggest construct, robot, or vehicle options, and provides plenty of destruction capability