Greater Good

The discard clause is the engine, not the tax on it. Sacrifice a creature, draw cards equal to its power, then discard three: the math only opens up when the body has enough power to outrun that three-card cost while burying the bin with fuel you actually want there. This is less a draw spell than a power-into-graveyard converter, which is why green's biggest creatures and reanimation-adjacent shells have always circled it. A five-power body nets two cards and stocks the yard with three; feed it seven or eight power and the engine pays real dividends while filling a graveyard other cards are eager to mine. The free activation cost is the dangerous part: no mana gate means a single fatty plus a way to keep replacing it becomes a loop limited only by what you can throw on the altar. Green rarely gets unconditional, mana-free card draw, and that transgression is bought back twice over: by the discard, and by the requirement to build a board worth eating. It is also one of the few sacrifice outlets that turns a creature's combat stat (power specifically, not toughness or mana value) into the resource being spent, which rewards exactly the lopsided green bodies the color produces in bulk. The result is an enchantment that sits inert until a big creature is about to die anyway, then converts the whole board into a refueled hand and a loaded graveyard in one activation.