Rospinae Soul Eater

Vigilance, Trample
As an additional cost to cast this spell, sacrifice
two creatures.
This creature enters the battlefield with a +1/+1 counter on it.
Magecraft- Whenever you cast or copy an instant
or sorcery spell, proliferate and you lose 1 life. If
this ability would make your life total less than 1, instead your life total becomes 1.