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Merfolk Aggro
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i would personally drop most the cards from this like the scythe, quest, leviathan, and skyscouts add in some spreading seas and better equipment but the scythe might work also add grand architect
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For being Merfolk aggro it doesn't seem all that aggressive. It seems more like an attempt at control (numerous counter spells, Lullmage Mentor, Acquisitor, etc). If you want to focus more on aggro, then reduce the counterspells a bit, take out the Mentor and the Trickster (and probably the Cryptologist too). Focus more on the Leviathan and islandwalk. Quicksilver Fountain, Streambed Aquitects, and Lord of Atlantis would be great. Also, consider Merrow Commerce, it's just an all-around awesome card for merfolk. Merfolk Wayfinder could also help to get the Leviathan out faster. If you want to focus more on control, then I'd say remove the Leviathans entirely.