Miki, Master Artificer

Affinity for Artifacts.
{t} : Replace (If the replace zone is empty,
exile an artifact you control and put it in the
replace zone, then create a x/x golem creature
token with the same name of the exiled card,
with x equal to the number of artifacts you control.
If there is a card in the replace zone, return that card
into the battlefield and destroy the token with its
name before exiling the new artifact).