Cast Micromancer by paying {3}{U}.
Micromancer enters the battlefield and triggers, searching your library for Dark Ritual and putting it into your hand.
Cast Dark Ritual by paying {B}.
Displacer Kitten triggers, blinking Micromancer.
Micromancer triggers, searching your library for Scheming Symmetry and putting it into your hand.
Dark Ritual resolves, adding {B}{B}{B} and going to the bottom of your library.
Cast Scheming Symmetry by paying {B}, 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.
Repeat from step 3.

Exile each opponent's library

Infinite black mana

Infinite ETB

Infinite LTB

Infinite magecraft triggers

Infinite storm count

Wheel of Sun and Moon

Displacer Kitten

Micromancer

Opposition Agent

Dark Ritual

Scheming Symmetry

Cast Micromancer by paying {3}{U}.
Micromancer enters the battlefield and triggers, searching your library for Dark Ritual and putting it into your hand.
Cast Dark Ritual by paying {B}.
Displacer Kitten triggers, blinking Micromancer.
Micromancer triggers, searching your library for Fruit of Tizerus and putting it into your hand.
Dark Ritual resolves, adding {B}{B}{B} and going to the bottom of your library.
Cast Fruit of Tizerus by paying {B}, targeting an opponent.
Displacer Kitten triggers, blinking Micromancer.
Micromancer triggers, searching your library for Dark Ritual and putting it into your hand.
Fruit of Tizerus resolves, causing the targeted player to lose 2 life and going to the bottom of your library.
Repeat from step 3.

Infinite lifeloss

Fruit of Tizerus

Combos with "Micromancer"