Zhalfirin Lancer

The trigger fires on the entry of other Knights, which quietly sorts this into a payoff rather than an enabler: it wants a board that keeps deploying Knights after it lands, not a single splashy follow-up. Each new Knight nudges the body to 4/4 and hands it vigilance until end of turn, so the reward stacks within a single turn if you can chain deployments together. That vigilance clause is the more interesting half. A 3/3 that only grows when you commit more creatures should, in principle, be forced to choose between building the board and attacking with what it has; the temporary vigilance dissolves that tension while the Knights keep coming, letting it swing and still stand back for blocks the moment the tribe floods out. The buff resetting at end of turn is what keeps the aggregate honest: the card never snowballs into a permanent threat on its own, and a sweeper erases both the counters-that-aren't and the creatures feeding them. What it's built for is the tribal aggro role white has printed variations of for years, the on-curve three-drop that turns a wide Knight deck's natural tempo into vertical pressure. Outside a board that reliably triggers it, the ability does nothing at all, and the vanilla 3/3 underneath is the honest floor.