Enigma Sphinx 



Artifact Creature — Sphinx
Flying
When this creature is put into your graveyard from the battlefield, put it into your library third from the top.
Cascade (When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order.)
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Mortuary 86%
$21.74#12962
"Whenever a creature is put into your graveyard from the battlefield, put that card on top of your library."