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Cards equivalent to Eldrazi Spawn (colorless tokens that can be sacrificed for mana):
1. Eldrazi Scion — Also a colorless creature token, can be sacrificed for {C}.
2. Servo — Creates colorless artifact creature tokens, but doesn't provide mana.
3. Treasure — Colorless token, can be sacrificed for any color mana, but is an artifact, not a creature.
4. Gold — Similar to Treasure, but not a creature.
Eldrazi Scion is the most equivalent, since it's a creature and can be sacrificed for {C}.
