MANAHIVE

Equivalent cards to Eldrazi Scion with similar colorless, sacrifice-for-mana abilities:
1. Eldrazi Spawn (Token Creature — Eldrazi Spawn, colorless, Sacrifice this creature: Add {C}.)
2. Gold (Token Artifact, colorless, Sacrifice this artifact: Add one mana of any color.)

While Gold adds any color, Eldrazi Spawn is exact except the name. Both fit the colorless, sacrifice-for-mana requirement. Eldrazi Scion is included as requested.