Tajuru Beastmaster

The payoff the Ally mechanic was always building toward, and the reason rally functioned as a snowball keyword rather than a one-time bonus. Every Ally that arrives while this is in play pumps your whole board, so the engine compounds: the more bodies you have already deployed, the harder each new entrance swings the combat math, until a single creature drop turns a stalled-out position into a lethal attack. The constraint that pays for that ceiling is the cost, six mana for a 5/5 with no evasion, and the awkward fact that its value scales with everything you played before it, which is backward from how most top-end creatures want to be deployed. It does fire its own rally on entry, pumping the team the turn it lands, but a lone +1/+1 spread across your board is a modest down payment when you have spent six mana. That tension is the design: a finisher that rewards a board built on the cheap, asking you to flood the table early and cash in late. Drop it onto an empty board and the rally trigger does almost nothing; the body is a fair-rate beater and little else. Drop it onto a wide one and it is the lever that converts a go-wide draw into a finishing turn. The card is never a vanilla creature, but the triggered ability lives or dies on the army already standing behind it.