Mad Descend

Target player mills X cards, where X is the
number of cards in their graveyard. (They put the
top X cards of their library into their graveyard.)
Madness {2}{u}{u} (If you discard this card, discard it
into exile. When you do, cast it for its madness cost or
put it into your graveyard.)
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They say that the mind is the worst prison of all.