i also noticed you dont have kabira vindicators they are really nice budget friendly
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1. UU counterspell is a little too mana intensive for a two colored evenly split deck. id say just stick with 4 mana leaks is enough 2. you can use less lands (20-22) since all of your converted mana costs are tiny 3. id use that extra space to throw in more creatures, since leveler decks are mostly about the creatures 4. consider using 4 skyfishers
i really question the usefulness of hada spy patrol id also go with two training grounds since not many of your creatures cost that much to level up anyways if you want to use 4, id say include some of the more expensive UW cards fill slots with 4 journey to nowheres. returning them with skyfishers is nice mana leaks are also great just because you have blue also remember the kabira crossroads (Y) use maybe 2