Chained Throatseeker

Most infect creatures threaten to poison a player from zero; this one refuses to start until someone else already has. The attack restriction inverts the usual order of operations and reclassifies the body entirely: it cannot apply the first counter, only finish a job already in progress. That single clause turns what would otherwise be a brutal clock into a closer. A 5/5 infect creature swinging freely would compress poison's ten-counter race to almost nothing, so the cost of the oversized statline is that it operates as a payoff rather than an engine, the back half of a two-creature plan whose front half someone else has to build. You need a poison-enabler to land that first counter before it can do anything on the attack. It reads as the curve-topper for a dedicated infect shell, the haymaker cast after the smaller, contested creatures have done the dangerous work of getting the opponent poisoned at all. Strip away that shell and the card still earns its keep on defense: a 5/5 wall whose infect means every block resolves as -1/-1 counters, permanently shrinking whatever it trades with rather than merely surviving the exchange. What it can never do alone is the one thing poison is actually built around, which is attack.