Black Panther, Vanguard

The Hero subtype gives white-green a token engine keyed to a narrow deckbuilding constraint: the payoff fires not when you cast creatures broadly, but when another nontoken Hero arrives. That distinction does the heavy lifting. Because the tokens it makes are ordinary Soldiers rather than Heroes, the trigger cannot cannibalize its own output, so the ceiling is set by how many discrete Hero bodies you can field rather than by a self-feeding board. Each trigger then forks between horizontal and vertical: another warm body, or a temporary team pump that converts an existing board into a lethal swing. That modal choice is where the card earns its slot. A static go-wide anthem would be predictable; the fork lets the same permanent play the long game (grinding out chump blockers one at a time) or the short one (turning a stalled board into a single crashing turn). The 4/4 body matters to the whole plan: it attacks and blocks as a genuine threat on its own, not a fragile engine piece that folds to the first removal spell, which keeps the strategy from collapsing when the payoff creature gets answered before it does any work. Structurally this is the old white-green tension between board width and board size resolved into a single trigger, with the Hero tag standing in as the tribal glue that decides which permanents feed the machine.