Diamond Weapon

The invulnerability clause is the hook, and it cuts against the grain of how green usually fields a fatty. Reach and an 8/8 body invite blocking, but the Immune keyword means combat can never trade with it: no double-blocking it down, no attacker gets to bite it on the way in. It answers combat by refusing to participate in the losing half of it, which quietly reframes the card from a beater into a wall that also hits for eight. The cost reduction pins it to a specific graveyard: not spells cast, not creatures died, but permanent cards sitting in the yard, so the payoff scales with self-mill, sacrifice value, and any deck that treats the graveyard as a second board rather than a resource to be spent. A deck stocked with lands, artifacts, and creatures in the bin can shave the down fast and land a 9-CMC threat well ahead of its printed rate. What makes the design sit oddly right is the tension between the two halves: the reduction rewards a grindy, attrition-heavy shell that fills its own graveyard, and the reward for surviving that grind is a creature that survives combat by fiat. It is a green top-end built for the long game that also punishes the opponent for having let the game go long.