Spawn-Gang Commander

The accounting happens the moment you announce the spell, not when it resolves. Because the three Eldrazi Spawn arrive off the cast trigger, they exist even if the Goblin body gets countered on the way down; kill or counter the creature and you still keep the ritual half of the card. (The tokens come from a triggered ability, so a well-timed Stifle does stop them; the point is that answering the creature after the trigger has already resolved does not.) What five mana buys is a self-contained package: three bodies that each convert into colorless mana, plus a repeatable ping (once the creature is on the battlefield and available to activate) that consumes any Eldrazi, Spawn or otherwise, to send two damage at any target. The devoid frame is load-bearing rather than cosmetic. A colorless Eldrazi Goblin slots into the Eldrazi shell that hungers for sacrifice fodder and the aristocrats decks that want bodies to convert, and it qualifies as ammunition for its own outlet. The design lineage is the ritual-plus-outlet creature: it pays for itself in resources, then holds a reach ability online for as many Eldrazi as you can feed it. It answers the perennial flaw in mana-making token generators (that there is nothing worth spending the mana on) by stapling the outlet directly to the source. The tokens are simultaneously the mana and the fuel.