Darmok, Herald of Swords

When Darmok, Herald of Swords enters the battlefield, you may search your library for an Equipment card and put it onto the battlefield.
If you do, you may attach it to another creature
you control, shuffle your library.
{1}{w}{r} Return Darmok, Herald of Swords to
your hand: Target creature gains protection
from the colour of your choice until end of turn.