Unstable Shapeshifter | Chainer, Nightmare Adept | Infinite Reflection

(and two other cards)

Creature with Mana Cost Equal to

Creature with Mana Cost Equal to ({0} magic symbol) in your graveyard.
Chainer in any zone.
All other permanents on the battlefield (
Unstable Shapeshifter as a copy of
Chainer).
Infinite Reflection attached to
Unstable Shapeshifter.

Discard a card to activate
Unstable Shapeshifter's ability from
Chainer, allowing you to cast a creature spell from your graveyard this turn.
Cast a creature spell from your graveyard by paying ({0} magic symbol) .
Due to
Infinite Reflection, 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, and
Unstable Shapeshifter's original ability.
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.