Istantaneo
Una creatura bersaglio prende -X/-X fino alla fine del turno, dove X è il numero di carte nel tuo cimitero.
Festive Funeral is still on the stack while you determine the value of X. It doesn't contribute to the value of X.
The value of X is determined only as Festive Funeral begins to resolve. The target creature's power and toughness won't change if other cards are put into your graveyard later in the turn.