In StarCraft, the Terran unit that can cloak and snipe enemy targets from long range is the Ghost.
Ghosts are elite Terran infantry trained for reconnaissance, assassination, and covert operations. Their most recognizable abilities include personal cloaking and the Lockdown spell, which can disable mechanical units in the original game. They can also call down a nuclear strike when supported by a nuclear silo.
The Ghost’s role reflects StarCraft’s portrayal of Terran warfare as a mixture of conventional military force and advanced technology. A Ghost is fragile compared with armored units, so players usually rely on stealth, positioning, and support.
The Wraith is a common mix-up because it is also a cloaking Terran unit. However, the Wraith is an aerial fighter, while the Ghost is a ground-based infantry unit associated with covert missions and precision attacks.