Book of Desdemona

(Transforms from Desdemona, Desperate Healer.)
{t}: Exile target creature you control. Return
target creature card with converted mana cost X
or less from your graveyard to the battlefield,
where X is the number of study counters on
Book of Desdemona plus the exiled card's
converted mana cost.
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Her tormented soul is bound to the book forevermore.