Infinite Reflection attached to Unstable Shapeshifter.
Any creature card that costs ({0} magic symbol) in graveyard.
Steps
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} magic symbol) .
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.