Aoife, the Second Wife

Vigilance, ward {3}
{2}{w}{b}{t}Exile target creature. That creature's controller puts a 0/1 white Swan creature token
with flying into play then If a player controls
four Swan creatures sacrifice Aoife, the Second
Wife and return up to four other creatures from
your graveyard to the battlefield.
"Come to the lake and mourn for your children."