Chasm Skulker

A creature that turns your draw step into a growth engine, then refuses to die quietly. The body that enters is a 1/1, which is the whole tension: it does nothing the turn it lands and asks you to keep it alive while you fill your hand. Every card you draw stacks a counter, so in a deck built to draw three and four cards a turn it balloons into a real threat fast, and then the second clause turns removal into a punishment. Kill it and the counters convert one-for-one into evasive Squid tokens, so the more you fed it, the worse the trade gets for whoever points a Doom Blade at it. The islandwalk on those tokens is the flavor doing structural work: against an opponent controlling an Island the swarm is effectively unblockable, and the counter math means the payoff scales with exactly the thing a draw-heavy deck was already doing. The design lesson is that a card which threatens to replace itself in token form changes how an opponent reads the board: a sweeper that catches it before it grows is fine, but waiting too long means clearing one creature only to hand its controller a horde. It rewards the patient durdle of a control or card-advantage shell, where the slow start is acceptable and the eventual board presence is enormous, and it punishes the impulse to kill the first interesting thing your opponent plays.