Everlasting Full Moon

When this card enters the battlefield, it becomes
night and cannot become day until this card
leaves the battlefield.
At the beginning of your upkeep, put an X/X werewolf creature token onto the battlefield
under your control where X is the number of werewolves you control. When Everlasting Full
Moon leaves the battlefield, sacrifice those tokens.
{2}{b}{g}{t}: Target werewolf you control fights
target non-werewolf creature you don't control.