Seamstress

As Seamstress enters the battlefield, exile any
number of creature cards from your graveyard.
At the beginning of your upkeep, you may put
a nonartifact card exiled with Seamstress into
your graveyard. If you do, create a token copy
of that card except it has -1/-1 and its an artifact
in addition to its other types.
Make all living things into machines. That's its
only goal.