At the beginning of your draw step, Maralen triggers, causing you to lose three life, then search your library for a card and put it into your hand.
During each opponent's draw step, Maralen triggers, causing them to lose three life, then causing you to search their library for a card and exile it.
You may play cards exiled this way due to Opposition Agent.

Players cannot draw cards

Tutor for any card in an opponent's library during their draw step with the ability to play that card

Maralen of the Mornsong

Opposition Agent

Cast Doomsday by paying {B}{B}{B}.
Hive Mind triggers, causing each opponent to copy Doomsday.
Resolve the first opponent's Doomsday, searching their library and/or graveyard for any five cards, exiling them due to Opposition Agent, exiling the rest of their library and graveyard, and causing them to lose half their life, rounded up.
Repeat step 3 for each other opponent.

Exile each opponent's library

Near-infinite lifeloss

Hive Mind

Doomsday

Cast Selective Memory by paying {3}{U}.
Hive Mind triggers, causing each opponent to copy Selective Memory.
Resolve an opponent's Selective Memory, causing you to search their library for all nonland cards and exile them due to Opposition Agent, with the ability to play them from exile.
Repeat step 3 for each remaining opponent.
Resolve your Selective Memory, exiling nothing from your library.

Cast any number of spell(s) from opponents' libraries

Exile all nonland cards from opponents' libraries

Selective Memory

Cast Mana Severance by paying {1}{U}.
Hive Mind triggers, causing each opponent to create a copy of Mana Severance.
Resolve each opponent's Mana Severance, searching their libraries for all land cards, exiling them and shuffling their library.
Resolve your Mana Severance, exiling no lands cards from your library and shuffling your library.
Cast Selective Memory by paying {3}{U}.
Hive Mind triggers, causing each opponent to create a copy of Selective Memory.
Resolve each opponent's Selective Memory, exiling the rest of each opponent's library.
Resolve your Selective Memory, exiling no nonland cards from your library and shuffling your library.

Mana Severance

Cast Mana Severance by paying {1}{U}.
Hive Mind triggers, causing each opponent to create a copy of Mana Severance.
Resolve each opponent's Mana Severance, searching their libraries for all land cards, exiling them and shuffling their library.
Resolve your Mana Severance, exiling no lands cards from your library and shuffling your library.
Cast Mind Grind by paying {1}{U}{B}.
Hive Mind triggers, causing each opponent to create a copy of Selective Memory.
Resolve each opponent's Selective Memory, revealing the rest of each opponent's library then put those cards into their graveyard.
Resolve your Selective Memory, revealing your cards until you reveal one land card from your library then puts all revealed cards to your graveyard.

Mill an opponent library

Mind Grind

Cast Mana Severance by paying {1}{U}.
Hive Mind triggers, causing each opponent to copy Mana Severance.
Resolve each opponent's Mana Severance, searching for and exiling all land cards from their libraries.
Resolve your Mana Severance, choosing not to exile any land cards from your library.
Move to your combat step.
Attack with Umbris.
Umbris triggers, creating a token copy of Umbris for each opponent you have, with each token tapped and attacking a different opponent.
Put all but one Umbris into your graveyard due to the legend rule.
Umbris triggers for each Umbris token that enters and each Umbris token triggers for itself and each other Umbris that enters.
Resolve the Umbris triggers, revealing no lands from opponent libraries and exiling each opponent library.

Near-infinitely large Umbris

Umbris, Fear Manifest

Blade of Selves

Cast Selective Memory by paying {3}{U}.
Holding priority, cast Sudden Substitution by paying {2}{U}{U}, exchanging control of Selective Memory and target creature an opponent controls.
Resolve Selective Memory, choosing to have the opponent exile all nonland cards in their library due to Opposition Agent.

Exile all nonland cards from target opponent's library, with the ability for you to play them from exile

Sudden Substitution

Cast Fractured Identity by paying {3}{W}{U}, exiling Skyship Weatherlight and creating a token copy of it under each other player's control.
Each new Skyship Weatherlight triggers, allowing you to control each opponent in turn and exile every artifact and creature card in their libraries.
You may play those cards for as long as they remain exiled.

Exile all artifact and creature cards in opponents' libraries; you may play those cards

Skyship Weatherlight

Fractured Identity

Cast Mana Severance by paying {1}{U}.
Hive Mind triggers, causing each opponent to copy Mana Severance.
Resolve each opponent's Mana Severance, searching for and exiling all land cards from their libraries.
Resolve your Mana Severance, choosing not to exile any land cards from your library.
Activate Umbris by paying {1}{U}, blinking Umbris.
Umbris triggers, revealing no lands from an opponent library, exiling their library.
Repeat from step 5 for each opponent.

Deadeye Navigator

Cast Mana Severance by paying {1}{U}.
Hive Mind triggers, causing each opponent to copy Mana Severance.
Resolve each opponent's Mana Severance, searching for and exiling all land cards from their libraries.
Resolve your Mana Severance, choosing not to exile any land cards from your library.
Activate Chainer by paying {B}{B}{B} and three life, returning a creature card from your graveyard to the battlefield as a black Nightmare in addition to its other creature types.
That creature enters the battlefield, triggering Umbris.
Resolve the Umbris trigger, revealing no lands from an opponent library, exiling their library.
Repeat from step 5 for each opponent.

Chainer, Dementia Master

Cast Mana Severance by paying {1}{U}.
Hive Mind triggers, causing each opponent to copy Mana Severance.
Resolve each opponent's Mana Severance, exiling all lands from their libraries.
Resolve your Mana Severance, choosing not to exile any lands from your library.
The next time you draw a card, Sphinx's Tutelage triggers, causing an opponent to mill two cards.
Because Painter's Servant will force the cards to share a color, and they will not be lands due to the opponent having no lands in their library, Sphinx's Tutelage will continue to repeat the process until the opponent's library is empty.

Infinite mill for target opponent every time you draw a card

Sphinx's Tutelage

Painter's Servant

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.

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