Kozilek's Predator

Four mana for a 3/3 reads as an overcost until you notice the two 0/1 Eldrazi Spawn are the actual product and the creature is the wrapper. Each Spawn is a one-shot ritual parked on the battlefield, ready to be cashed into colorless mana whenever the moment arrives, which reframes the card from a beater into a delayed ramp engine that leaves a body behind. The Spawn can accelerate you the turn this lands, since sacrificing them doesn't require tapping; but they can also sit as fixed assets, two potential mana split across two permanents, waiting to fuel the enormous colorless costs the Eldrazi were built to demand. The trick is that the mana lives on creatures rather than in your hand: it survives until you commit it, dodges discard, chump-blocks once on the way out, and feeds any sacrifice-hungry payoff that cares about bodies leaving the battlefield rather than mana itself. That triple identity (ramp, chump fodder, fixed sacrifice fuel) is what separated this kind of green Eldrazi enabler from a plain mana dork. A Llanowar Elves gives you mana every turn but nothing disposable to throw away; this hands you a finite battery and a pair of things to feed a grinder. The 3/3 on top keeps the package from collapsing into pure setup: a clock and a blocker stapled to the ramp so the turn you cast it isn't wasted waiting.