Serra Sphinx

A 4/4 flier with vigilance for five mana is the kind of efficient blue beater that lands in a corner of the color pie blue has always had to borrow. Vigilance is fundamentally a white-and-green keyword: attack without dropping your guard. Granting it to a blue evasive body lets the Sphinx pressure a planeswalker or a life total while still patrolling the ground against whatever the opponent assembles, a posture blue normally has to buy with extra cards or extra mana. The body itself is honest: no enters-the-battlefield value, no protective shroud, no card advantage stapled on. It is a fair blue creature in a color that historically priced its fliers around control rather than the red zone, which is exactly the design conceit at work here, a deliberate "what if blue got the white-style sentinel" exercise that recasts a familiar two-keyword stat line through an off-color lens. The result is a clean tempo piece: it closes a game from the air without committing you defensively, and the vigilance means it can swing into an open board on a turn you also want a blocker. There is no trick or trigger to plan around, which keeps the evaluation simple and the card useful wherever a resilient five-drop with reach into the win is wanted.