Stonehewer Giant
Creature — Giant Warrior
Vigilance
, 
: Search your library for an Equipment card, put it onto the battlefield, attach it to a creature you control, then shuffle.
"No matter how strong, an unarmed fighter is no more than a fool."
Steve Prescott
Modern Masters (MMA)
• #31Rulings
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.
(wotc • 2020-08-07)
If there is no legal creature for you to attach the Equipment to, it remains on the battlefield unattached.
(wotc • 2020-08-07)
Rulings
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.
(wotc • 2020-08-07)
If there is no legal creature for you to attach the Equipment to, it remains on the battlefield unattached.
(wotc • 2020-08-07)