Shared Animosity
The math here is quadratic where most tribal payoffs are linear. An anthem hands every creature a flat bonus; this scales each attacker by the other attackers sharing its type, so a five-creature swing isn't five small boosts but a stack of them, each soldier or goblin counting all four of its peers. The payoff curves upward as the board widens, which is the inverse of how tribal aggro normally degrades into the late game: a creature-heavy deck flooding the board is exactly the scenario most attrition wants you in, and this turns that overcommitment into a kill. Two design decisions keep it from being a blowout machine. First, the bonus is power only, so it pads a swing rather than surviving it; the creatures still die to whatever was going to block them. Second, it triggers on attack and ends each turn, so it does nothing on defense and nothing to push through a board it can't profitably attack into. The shared-type clause is the real engine: it rewards a deck built around one creature type to the exclusion of splashes, and punishes the toolbox builds that hedge across tribes. In a clean tribal shell it is a one-card overrun that only gets nastier the longer the game goes, which is precisely the spot most go-wide decks struggle to convert.
