Lilitu, The Second Mother

Flying Vigilance Lifelink

A thousand young - You may pay life rather than mana to cast Demon and Angel spells. If more than half of the mana used to cast a Demon spell was gained by this effect the Spell gains Cascade

Second Mother - When Lilitu, The Second Mother enters, you draw X cards and you lose X life, where
X is the number of Demons you control.