Good old Delver, Monoblue aggro-tempo.
Drop early threats and back them up with counterspells, bounce and card drawing.
Ninja of the Deep Hours can draw you loads of cards while resetting Spellstutter Sprite for extra value.
Cloud of Faeries is fantastic, it's a free spell that boosts Spellstutter Sprite's countering ability. It's also evasive to enable Ninja and can cycle away if you draw it late game and you don't want it for some reason.
Spire Golem is a cheap creature that also blocks well
Bonesplitter upgrades any creature into a decent threat.
Treasure Cruise is there in place of Gush, although perhaps it's better?
Sideboard:
Stormbound Geist is excellent against control decks since they need to kill it twice (or just counter it, but you should be able to keep one blue up for Dispel, right?). It's also good against the mirror match, since it starts big enough to trade with most of the opponent's creatures and then comes back bigger!
Curse of Chains locks down decks that win with big annoying creatures.
Hydroblast seems obvious.
Annul is for affinity and hexproof decks.
Dispel is against burn decks and decks that are heavy on counterspells and/or instant speed removal.
