Toshiro, the Oathsworn

When Toshiro, the Oathsworn enters the battlefield, you may attach target Equipment
you control to it.
Whenever an Equipment enters the battlefield
under your control, you may pay {b}. If you do,
return Toshiro, the Oathsworn from your
graveyard to the battlefield. It's a black Zombie
in addition to its other colors and types.
"I will not be made a liar."