Selune, Oracle of Shadows

When Selune, Oracle of Shadows enters the battlefield,Target Player puts the top {x} cards of the top of their Library
into their Graveyard.
{t}{2}{u/b}{u/b} Until your next turn, for every creature card that is put into the Graveyard
from play, Opponents put that many cards
from the top of their library into their
Graveyard.