Swarm Shambler

Most one-drops that grow are simple mana sinks: pay, tick up, repeat. This one adds a punishment clause aimed at exactly the interaction its own game plan invites. A counters deck wants its creatures big, and big creatures draw removal; the middle ability converts that removal into a toll by spawning a 1/1 Insect whenever an opponent targets one of your creatures carrying a +1/+1 counter. It does not counter the spell or shield the target: it only makes the trade worse for the caster, so a clean kill still leaves you with a body. And because it arrives already holding a counter, the clause is live from the moment it resolves, itself included; answer it immediately and its controller still walks away with an Insect. The trigger reads broadly (any spell an opponent controls, not just removal), so bounce, a targeted pump on your blocker, even an opponent's own buff aimed at your side all feed it, though in practice it is the kill spell that pays the fee. The self-growth ability keeps the engine turning when nobody is trading with you, and because the token generator watches every counter-carrying body you have rather than just this one, its value climbs with the board around it. That is the trade the design strikes: a lord-adjacent counters payoff for a single green mana that lands as its own first threat and its own first tripwire.