Symbiotic Beast

The death trigger is the entire pitch, and the body is just the casing that delivers it. A single 4/4 that splinters into four 1/1 Insects when it dies turns spot removal into a bad trade for the opponent: point a kill spell at it and the battlefield ends up wider than it started, which makes blocking the Beast a worse proposition than its toughness suggests. The strategic axis is conversion. Trade it in combat or feed it to a sacrifice effect and you have not lost a creature, you have exchanged one body for four, a board state that scales with anthems, fuels convoke, and refills sacrifice fodder. That arithmetic earns the slot in any go-wide build, not the stat line. The rate is honest rather than exciting: a pile of token value bolted onto a creature that has to die before it pays out, so the trigger reads as a consolation for losing the body rather than free upside on top of it. This is the green answer to one-for-one removal in any era where decks lean on individual kill spells: the swarm is insurance against the single answer that would have cleanly handled a lone fattie, and the only way to fully deny it is to exile the Beast or shrink the whole board at once.