Aven Surveyorutility$0.03A flash flying creature that provides a similar end-step ambush role and evasive body. It also adds tempo by bouncing a creature on entry.
Windrider Patrolfinisher$0.21A blue flying threat with a comparable evasive combat role. It becomes much larger through spellcasting, making it a similar finisher in spells-heavy decks.
Sphinx of Foresightutility$0.34A flash flying creature with a similar surprise-factor role in blue. It offers additional card selection and an efficient evasive body.
Spectral Sailorutility$0.13A flash flying blue creature that can be deployed at instant speed for defense or pressure. It is much cheaper, but fills the same evasive tempo slot.
Vendilion Cliqueutility$3.17A flash flying blue creature that functions as a disruptive instant-speed threat. It shares the same ambush-and-pressure play pattern.
Nightpack Ambusherutility$0.48A flash creature that rewards holding up mana and plays at instant speed like Spire Monitor. While not flying, it fills a similar reactive threat role in blue-based decks.
Hullbreaker Horrorfinisher$4.95A flash blue finisher that can be deployed at instant speed and dominates the board. It is much larger and more powerful, but serves as a similar end-step threat in control decks.
Shimmer Dragonfinisher$0.41A large flying blue creature that can take over the game as an evasive finisher. It lacks flash, but its role as a resilient airborne threat is similar.