Mishra, Brooding Brother

Imprint - When Mishra, Brooding Brother enters
the battlefield, you may exile a creature card from
your hand or the top card from your library.
{u}{r}, {t}: Create a token that's a copy of a
creature card you own in exile, except it's an
artifact and an Assembly-Worker in addition to
its other types, and has base power and toughness
2/2.
{p/b}, sacrifice an Assembly-Worker : populate.
To defeat my Brother, I need an army.