"One scratch on a wall meant safe passage, two that the target had already been raided, and three warned of a trap."
—*Weaponry of Kamigawa*

Shuko

Equipped creature gets +1/+0.
Equip {0} ({0}: Attach to target creature you control. Equip only as a sorcery.)

The List

Betrayers of Kamigawa

You may activate this card’s equip ability targeting the creature that it is currently attached to, even if it’s the only creature you control. Since the equip ability costs zero, you can do this as many times as you like during your main phases, though it generally won’t do anything.