Path of Annihilation (MH3-165) [Modern Horizons 3]

Devoid (This card has no color.)
When this enchantment enters, create two 0/1 colorless Eldrazi Spawn creature tokens with "Sacrifice this token: Add ."
Eldrazi you control have ": Add one mana of any color."
Whenever you cast a creature spell with mana value 7 or greater, you gain 4 life.