Venerable Kumo

A 2/3 with reach is a wall built to lose: it stops the air war the Spirit tribe leans on, then pays off the moment it dies by clawing back any Spirit costing four or less. That return clause is the deepest the cycle reaches, enough to retrieve nearly every recursive body the deck wants in hand again, so trading creatures stops being attrition and starts being a loop. The reach is what justifies the otherwise toothless body: a green blocker that answers flying while feeding the graveyard does double work, and the chain only matters if the creature can survive long enough to die on a block that meant something. The design tension is plain. Offensively this does almost nothing; a 2/3 that wants to be blocking is not racing anyone. It buys that passivity by being the engine piece you are glad to lose, because losing it is the trigger. This recursion never asked for sacrifice outlets the way later aristocrat builds did: it cared only that the creature died and that something worth returning sat in the yard. This sits at the top of that curve, the body you cash in to keep the others flowing back.