Vigilance
{1}{W}, {T}: Search your library for an Equipment card, put it onto the battlefield, attach it to a creature you control, then shuffle.
If there is no legal creature for you to attach the Equipment to, it remains on the battlefield unattached.
Stonehewer Giant's ability doesn't target a creature. However, the creature must be able to be legally equipped by the Equipment. For example, you could attach the Equipment to a creature with shroud, but not to one with protection from artifacts.