Ioudon, Mitr Oni

Idle {r}{r}{r} (If you cast this card for its idle cost, it's
an Equipment spell that enters the battlefield attached
to a creature of your choice. It becomes a creature
again if not attached to a creature.)
Ioudon and equipped creature each get +1/+1 for
each other artifact you control.
If Ioudon's idle cost was paid and it's a creature, sacrifice it at the beginning of the next end step.