Cirrina, Cruel Reclaimer

When Cirrina, Cruel Reclaimer enters the battlefield, choose an opponent. If they
have fewer cards in their graveyard than you,
they mill cards equal to the difference. Then you
may put a creature card from that player's
graveyard with converted mana cost X or less
onto the battlefield under your control, where X
is the number of cards milled this way.
"How childish of you to think you could run from my lessons."