Scarlet, Lady Necessity

When Scarlet enters the battlefield, draw two
cards, then you may put an artifact card with converted mana cost 3 or less from your hand
onto the battlefield tapped.
Artifact spells cost {1} less to cast as long as
Scarlet is untapped.
{x}, {t}, Exert Scarlet: Search your library for an artifact card with converted mana cost X, put it
on the battlefield, then shuffle your library.