Twilight Sluaghs

Linger (Whenever you cast an instant or sorcery
spell, you may pay {2} and exile this card from your graveyard. If you do, add the bracketed phrase to the triggering spell.)
Flying
When Twilight Sluaghs enters the battlefield,
[target opponent discards two cards, then mills
two cards.] Create a 1/2 black spirit creature
token with flying for each creature card that
entered an opponent's graveyard this way.