Cast Mirror-Mad Phantasm by paying {3}{U}{U}.
When Mirror-Mad Phantasm enters the battlefield, Unstable Shapeshifter triggers, causing Unstable Shapeshifter to become a copy of Mirror-Mad Phantasm until end of turn.
Activate Unstable Shapeshifter by paying {1}{U}, shuffling Unstable Shapeshifter into your library and milling your entire library due to it not having a card named Mirror-Mad Phantasm in it.

Infinite self-mill

Mirror-Mad Phantasm

Unstable Shapeshifter

Discard a card to activate Unstable Shapeshifter's ability, allowing you to cast a creature spell from your graveyard this turn.
Cast a creature spell from your graveyard by paying {0}.
That creature enters the battlefield as a copy of Unstable Shifter copying Chainer.
Put that creature in the graveyard due to the legend rule.
That creature entering the battlefield and dying triggers its own Chainer ability, Unstable Shapeshifter's Chainer ability, Unstable Shapeshifter's original ability, and Liliana.
Resolve the two Chainer triggers, failing to grant anything haste.
Resolve the Liliana trigger, drawing a card.
Resolve the Unstable Shapeshifter ability, causing it to become a new copy of Chainer that has not yet activated its ability this turn.
Repeat.

Infinite draw triggers

Infinite looting

Near-infinite death triggers

Near-infinite ETB

Near-infinite LTB

Near-infinite self-discard triggers

Near-infinite storm count

Chainer, Nightmare Adept

Infinite Reflection

Liliana, Dreadhorde General

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