Bull Aurochs
The whole pitch lives in a creature type nobody was building around. Aurochs are a tribe that exists almost entirely as a joke about its own obscurity, and this is the payoff card: a green attacker that swells by the number of other Aurochs swinging beside it. Standing alone it is a fragile 2/1 with trample, a body that trades down to almost anything. Sent in alongside a full board of its kin, it scales linearly with every additional Aurochs in the red zone, and trample turns that accumulated power into damage that does not get chump-blocked away. The design is honest about what it costs: the payoff is real only if you have committed to the silliest possible tribal build, and the reward is proportional to that commitment. That is the tension a tribal payoff always navigates, but this one resolves it without the usual anthem static-ability template: instead of buffing the team, it buffs only itself, and only when attacking, which keeps it a glass cannon rather than a board-wide threat. The result is a card that does exactly one thing well and asks you to construct an entire deck around enabling it. For a tribe this small, that ask is the point.
