Entrapta, Master Tinkerer

When Entrapta enters the
battlefield, create an X/X legendary
construct named Emily,
its power and tougness are
equal to the number of artifacts you control.
{u/b}, Sacrifice an artifact, draw a card and add {r}.
{r}{r}{r}, return target artifact from a
graveyard to the battlefield.
Whenever an artifact is put into an
opponents graveyard, draw a card.