Micromancer enters the battlefield and triggers, searching your library for Dark Ritual and putting it into your hand.
Cast Dark Ritual by paying ({B} magic symbol) .
Displacer Kitten triggers, blinking Micromancer.
Micromancer triggers, searching your library for Scheming Symmetry and putting it into your hand.
Dark Ritual resolves, adding ({B} magic symbol) ({B} magic symbol) ({B} magic symbol) and going to the bottom of your library.
Cast Scheming Symmetry by paying ({B} magic symbol) , targeting any two players.
Displacer Kitten triggers, blinking Micromancer.
Micromancer triggers, searching your library for Dark Ritual and putting it into your hand.
Scheming Symmetry triggers, exiling a card from each targeted opponent's library due to Opposition Agent's effect, and going to the bottom of your library.