Aiva, the Blood Siphon

Devoid (This card has no color.)
Whenever a creature dies you may pay 2 life,
if you do create a 0/1 eldrazi spawn token that
has "You may sacrifice this card to add {1} to
your mana pool"
If Aiva, the Blood Siphon would be destroyed
you may sacrifice two creatures to tap her and
give her indestructible