Gee, I'm sure glad blue is finally getting some awesome creatures to go along with delver and snapcaster to corner the "efficient/powerful" creature market. It was so unfair that blue was limited to just having the best instants and sorceries in the game.
Next up - blue artifacts, enchantments, and lands!
Urza's Vice - U - Artifact - During each opponent's upkeep, that player loses 1 life for each card they have in their hand.
Oath of Urza - 1U - Enchantment - During your upkeep, if you have more instants or sorceries in your graveyard than any opponent, exile cards from the top of your library until you reveal a non-blue card. You may cast all spells exiled this way at any time without paying their mana cost.
Urza's Workshop - Land - T: add UUUU to your mana pool. This mana may only be used to cast blue spells or activate abilities of blue permanents.