From Beyond

Devoid (This card has no color.)

At the beginning of your upkeep, put a 1/1 colorless Eldrazi Scion creature token onto the battlefield. It has "Sacrifice this creature: Add [1] to your mana pool."

[1][G], Sacrifice From Beyond: Search your library for an Eldrazi card, reveal it, put it into your hand, then shuffle your library.