Troy Calypso, the Leech

Other Sirens you control get -3/-1.
Troy Calypso, the Leech gets +3/+1 if you
control another Siren.
When Troy Calypso, the Leech enters the
battlefield, create a 0/2 Camera artifact creature
token with flying.
Sacrifice an artifact: Troy Calypo, the Leech deals
two damage to any target.