Grappling Marauder

Whenever Grappling Marauder attacks, you may
pay {2}{r}. If you do, attach target artifact to it. If
it's not an Equipment, it becomes an Equipment artifact with "Equipped creature gets +X/+X,
where X is this artifact's mana value" and loses
all other card types and abilities for as long as it remains attached to Grappling Marauder.
They're staunch adherents of the age-old tenet of
grabbing the largest object within reach and smashing
with it.