Voxmala, Banshee Queen

Banshee creatures you control get +1/+1 and
have shadow.
Whenever a nontoken creature dies, create a 0/0
white Banshee Spirit creature token.
Sacrifice two Banshee Spirit tokens: Target play-
er loses 1 life, and you gain 1 life.
Her mournful cry unites the lost souls, for they are her eternal choir.