Catacomb Sifter

Devoid (This card has no color.)
When Catacomb Sifter enters the battlefield, put a 1/1 colorless Eldrazi Scion creature token onto the battlefield. It has "Sacrifice this creature: Add to your mana pool."
Whenever another creature you control dies, scry 1 (To scry 1, look at the top a card(s) of your library, then put any number of them on the bottom of your library and the rest on top in any order.).