Swarming phantoms

Flying, Daybound,(as this creature enters the battlefield it becomes night if its neither day nor night. at each upkeep if a player cast no spells last turn it becomes night and if a player cast two or more spells last turn it becomes day.)
At the end of each upkeep if its still night create a token copy of swarming phantoms if this isn't a token. When it becomes day sacrifice Swarming phantoms