Nakia, Wakandan Operative

Two threat vectors converge here, and neither depends on Nakia's own 3/3 body. The first is the monarchy: a commander-entry trigger hands you the crown every time you cast or recast your leader, turning the recursion loop that the command zone already encourages into a repeatable draw engine. Because the crown changes hands only through combat damage or another monarch trigger, a green deck that can reliably re-deploy its commander becomes hard to pry the crown from, and the extra card each end step feeds the second axis: the counter machine. Two +1/+1 counters per activation is a modest rate on paper, but the sorcery-speed limit is the honest tax on an ability that stacks turn over turn. Point it at a Vehicle to crew it several sizes up, or grow a single carrier into something that ends games behind the reach that lets Nakia hold the ground the monarch line asks you to keep. The design's real trick is that it does not ask you to build around Nakia specifically; it asks you to build around your commander entering, which most decks already do. That makes the monarch trigger the load-bearing piece: it rewards the blink and recursion effects a green midrange shell wants anyway, and it converts the crown into a resource the counter ability can spend time compounding. A support piece dressed as a hero, valuable for what it feeds rather than what it swings.